US20150181803A1 - Mid-Mount Mower - Google Patents
Mid-Mount Mower Download PDFInfo
- Publication number
- US20150181803A1 US20150181803A1 US14/489,981 US201414489981A US2015181803A1 US 20150181803 A1 US20150181803 A1 US 20150181803A1 US 201414489981 A US201414489981 A US 201414489981A US 2015181803 A1 US2015181803 A1 US 2015181803A1
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- US
- United States
- Prior art keywords
- vehicle body
- coupling
- mower
- locking
- intermediate structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/006—Control or measuring arrangements
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/64—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis mounted on a vehicle, e.g. a tractor, or drawn by an animal or a vehicle
- A01D34/66—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis mounted on a vehicle, e.g. a tractor, or drawn by an animal or a vehicle with two or more cutters
- A01D34/661—Mounting means
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/64—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis mounted on a vehicle, e.g. a tractor, or drawn by an animal or a vehicle
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/64—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis mounted on a vehicle, e.g. a tractor, or drawn by an animal or a vehicle
- A01D34/66—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis mounted on a vehicle, e.g. a tractor, or drawn by an animal or a vehicle with two or more cutters
- A01D34/664—Disc cutter bars
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/74—Cutting-height adjustment
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D34/00—Mowers; Mowing apparatus of harvesters
- A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
- A01D34/81—Casings; Housings
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D67/00—Undercarriages or frames specially adapted for harvesters or mowers; Mechanisms for adjusting the frame; Platforms
- A01D67/005—Arrangements of coupling devices
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D69/00—Driving mechanisms or parts thereof for harvesters or mowers
- A01D69/002—Driving mechanisms or parts thereof for harvesters or mowers driven by power take-off
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D2101/00—Lawn-mowers
Definitions
- the present invention relates to a mid-mount mower having a mower unit disposed under a vehicle body between front wheels and rear wheels.
- a blade housing covering a rotary blade is connected to a lift link mechanism having a front link and a rear link attached to a vehicle body and spaced apart from each other in a vehicle front/rear direction. With this, the blade housing can be lifted up/down between a lowered working position and an elevated non-working position.
- the mower unit is dismounted from the vehicle body. It is very troublesome to carry out a connecting/disconnecting operation thereof in a limited space between the front wheels and the rear wheels. For this reason, it has been proposed to carry out at least some steps of the connecting/disconnecting operation in an automated manner.
- Patent Document 1 in association with a forward traveling of the vehicle body, left and right front wheels roll over a blade housing, with utilizing a front wheel guide plate of this blade housing, to be positioned eventually at the body portion of a tractor. Then, in association with a final forward traveling, connection pins provided at free ends of a pair of left and right rear links are guided by openings formed at hook portions of a pair of left and right support stays provided in the blade housing and engaged into the deepest parts thereof.
- connection of the front link needs to be carried out manually after connection of the rear link. After the connection pins of the pair of left and right rear links are guided by the openings of the hook portions of the blade housing and engaged into the deepest parts thereof, connection is established between the vehicle body and the blade housing.
- this automatic connection arrangement cannot be directly retrofitted with a conventional existing lift link mechanism.
- three points of the front-side hitch pin, the rear-side hitch pin and an output shaft side coupling need to be positioned with precision in three-dimensional manner with three points of the front-side hitch bracket, the rear-side hitch bracket and an input shaft side coupling, respectively. Hence, this connecting operation is difficult.
- the mower having a mower unit mounted under a vehicle body between front wheels and rear wheels, the mower comprises:
- a lift link mechanism having a front link and a rear link provided in the vehicle body and spaced apart from each other in a vehicle body front/rear direction;
- a guide face configured to guide the engaging portion and the engaged portion to an engaging position in association with a movement of the vehicle body in the vehicle body front/rear direction so as to establish connection between the blade housing placed on a ground surface and the intermediate structure.
- an intermediate structure for mediating establishment of this connection between the link mechanism and the blade housing.
- this intermediate structure is only connected pivotally to one end of the front link and one end of the rear link, which links together constituting the lift link mechanism.
- the engaging portion and the engaged portion used for automatic connection with the blade housing are provided in the intermediate structure and the blade housing, respectively. Therefore, essentially, it is also possible to use a conventional existing lift link mechanism as it is. Further, positioning or alignment between the engaging portion and the engaged portion at the time of connection establishment is guided by the guide face. Thus, a certain amount of positioning error can be tolerated in the movement of the vehicle body in the front/rear direction, so that the trouble for the driver of the vehicle body can be alleviated.
- the mower comprises:
- a lift link mechanism having a front link and a rear link and configured to suspend the mower unit
- a blade housing having an engaged portion engageable with an engaging portion provided in the vehicle body in association with a movement of the vehicle body in a vehicle body front/rear direction;
- a blade power transmission mechanism having a vehicle body side power transmission mechanism and a mower side power transmission mechanism as units separate from each other and having also a power coupling mechanism for coupling an output shaft of the vehicle body side power transmission mechanism with an input shaft of the mower side power transmission mechanism;
- a coupling operational tool for establishing coupling between the input shaft and the output shaft by displacing the power coupling mechanism in the vehicle body front/rear direction.
- the engaging portion provided on the side of the vehicle body comes into engagement with the engaged portion provided on the side of the blade housing.
- connection between the vehicle body and the mower unit is realized.
- the vehicle body and the blade housing are fixed in position relative to each other. Therefore, the subsequent coupling operation between the input shaft and the output shaft by the power coupling mechanism using the coupling operational tool can be carried out smoothly.
- connection between the vehicle body and the mower unit and the connection of the power transmission mechanism from the vehicle body side to the mower unit side are effected in two steps, so that the connecting/mounting operation of the mower unit to the vehicle body can be carried out in a reliable manner.
- FIG. 1A is a schematic for explaining a first basic configuration of a mid-mount mower according to the present invention, showing a state immediately before an intermediate structure mower unit 4 is connected to a vehicle body,
- FIG. 1B is a schematic for explaining the first basic configuration of a mid-mount mower according to the present invention, showing a state in which the mower unit is connected to the vehicle body,
- FIG. 2 is a side view showing a mid-mount mower as one of a first embodiment of the present invention
- FIG. 3 is a perspective view showing a mower unit
- FIG. 4 is a plan view showing a lift link mechanism and an intermediate structure
- FIG. 5 is a perspective view showing the lift link mechanism and the intermediate structure
- FIG. 6 is an exploded perspective view showing the lift link mechanism and the intermediate structure separately from each other
- FIG. 7A is a section showing a flip-up mechanism for a gauge wheel, showing a state in which a rear gauge wheel is placed in contact with a ground surface,
- FIG. 7B is a section showing a flip-up mechanism for a gauge wheel, showing a state in which the rear gauge wheel is flipped up,
- FIG. 8 is a plan view showing the mower unit
- FIG. 9 is a plan view showing the mower unit and the intermediate structure before coupling of a power coupling mechanism
- FIG. 10 is a plan view showing the mower unit and the intermediate structure after the coupling of the power coupling mechanism
- FIG. 11 is a vertical section showing a right-side functional portion of a first locking mechanism
- FIG. 12 is a side view showing the first locking mechanism before coupling and showing also a blade housing in its section,
- FIG. 13 is a side view showing the first locking mechanism after the coupling and showing also the blade housing in its section,
- FIG. 14 is a side view showing the mower unit lifted up by the lift link mechanism
- FIG. 15 is a perspective view showing the first locking mechanism and a second locking mechanism
- FIG. 16 is a perspective view showing a state in which a portion of connection between the intermediate structure and the blade housing is locked by the first locking mechanism and the second locking mechanism,
- FIG. 17A is a schematic showing the first basic configuration of the mid-mount mower according to the present invention, showing a state immediately before the intermediate structure mower unit 4 is connected to the vehicle body,
- FIG. 17B is a schematic showing the first basic configuration of the mid-mount mower according to the present invention, showing a state in which the intermediate structure mower unit 4 is connected to the vehicle body,
- FIG. 18 is a side view showing a mid-mount mower as one of a second embodiment of the present invention.
- FIG. 19 is a perspective view showing a mower unit
- FIG. 20 is a plan view showing a lift link mechanism and an intermediate structure
- FIG. 21 is a perspective view showing the lift link mechanism and the intermediate structure
- FIG. 22 is an exploded perspective view showing the lift link mechanism and the intermediate structure separately from each other,
- FIG. 23 is a plan view showing the mower unit singly
- FIG. 24 is a plan view showing the mower unit and the intermediate structure before coupling of a power coupling mechanism
- FIG. 25 is a plan view showing the mower unit and the intermediate structure after coupling of the power coupling mechanism
- FIG. 26 is a perspective view showing the intermediate structure
- FIG. 27 is a perspective view showing a variation of an attaching unit provided in the intermediate structure.
- FIG. 28 is a plan view showing the intermediate structure shown in FIG. 27 .
- FIG. 1A and FIG. 1B A mid-mount mower (to be referred to simply as “mower” hereinafter) shown in FIG. 1A and FIG. 1B allows mounting of a mower unit 4 between front wheels 2 a and rear wheels 2 b under a vehicle body 1 having a vehicle body frame 10 as a principal constituent thereof. Downwardly of the vehicle body 1 , there is provided a lift link mechanism 3 consisting of a pair of left and right front links 31 and a pair of left and right rear links 32 .
- an intermediate structure 6 is suspended.
- the intermediate structure 6 is lifted up/down relative to a ground surface. That is, the lift link mechanism 3 and the intermediate structure 6 together constitute an upper structure 9 for mounting the mower unit 4 to the vehicle body 1 .
- detachable connection is realized with a blade housing 40 as a principal component of the mower unit 4 .
- the upper structure 9 functions as an adaptor for interconnecting the vehicle body 1 and the mower unit 4 , with allowing the latter to be lifted up/down relative to the former.
- the intermediate structure 6 functions as an adaptor for connecting the lift link mechanism 3 to the mower unit 4 .
- the intermediate structure 6 includes engaging portions 610
- the blade housing 40 of the mower unit 4 includes engaged portions 620 engage able with the engaging portions 610 .
- FIG. 1A shows a state immediate before establishment of connection between the intermediate structure 6 and the mower unit 4 .
- FIG. 1B shows a state after the connection establishment.
- the trajectory of the front wheel 2 a at the time of connection is illustrated by a dotted line in FIG. 1A .
- the engaging portions 610 of the intermediate structure 6 come into engagement with the engaged portions 620 of the blade housing 40 , whereby connection is established between the mower unit 4 and the intermediate structure 6 .
- connection is realized between the mower unit 4 and the vehicle body 1 of the mower.
- guide faces 630 for guiding the engaging portions 610 to engagement positions for the engagement with the engaged portions 620 are formed in one or both of the intermediate structure 6 and the mower unit 4 .
- the mode or form of engagement between the engaging portion 610 and the engaged portion 620 can vary in many ways.
- a hole (slit)-pin engagement arrangement is preferably used which consists of an elongate slot extending in the vehicle body moving direction and an engaging pin engageable into this elongate slot.
- a recess-ball arrangement can be cited which consists of a curved recess opened in the vehicle body moving direction and a ball member coming into this curved recess.
- an inclined face can be used which is inclined relative to the vehicle body moving direction and configured to provide guiding to an appropriate position in association with traveling of the vehicle body. Especially, if such inclined face is provided in one or both of the engaging portion 610 and the engaged portion 620 , the arrangement can be simplified advantageously.
- the mower unit 4 has no power source of its own. Therefore, power from an engine 23 mounted on the mower is received via a working power transmission mechanism 25 to rotate a blade 43 provided in the blade housing 40 .
- This working power transmission mechanism 25 includes a vehicle body side power transmission mechanism 25 A and a mower side power transmission mechanism 25 B as separate units. In operation, when connection is established between a free shaft end (to be referred to also as “output shaft” hereinafter) of the vehicle body side power transmission mechanism 25 A and a free shaft end (to be referred to also as “input shaft” hereinafter) of the mower side power transmission mechanism 25 B, engine power is transmitted to the blade 43 .
- the output shaft of the vehicle body side power transmission mechanism 25 A and the input shaft of the mower side power transmission mechanism 25 B are connected or coupled via a power coupling mechanism 7 .
- this power coupling mechanism 7 is supported to the intermediate structure 6 .
- the mechanism 7 can also be supported to the mower unit 4 .
- the power coupling mechanism 7 includes a coupling body 70 having a first coupling end to be connected to the output shaft and a second coupling end to be detachably connected to the input shaft.
- the coupling body 70 is relatively displaced or preferably, relatively displaced linearly, between a coupling position realizing the coupling between the vehicle body side power transmission mechanism 25 A and the mower side power transmission mechanism 25 B and a decoupling position realizing decoupling therebetween.
- a locking mechanism(s) is provided for mechanically retaining the connecting positions between the engaging portions 610 and the engaged portions 620 realizing connection between the lift link mechanism 3 and the mower unit 4 via the intermediate structure 6 and the coupling position of the coupling body 70 .
- Such locking mechanism can be a spring urging mechanism or retention mechanism.
- an operation of the locking mechanism is effected by an operational member or tool extending to the periphery of a driver's seat 21 .
- the connecting positions between the engaging portions 610 and the engaged portions 620 and the coupling position of the coupling body 70 are locked by a common locking mechanism.
- separate locking mechanisms can alternatively be provided for locking them individually.
- the blade housing 40 in order to vary its ground level (i.e. its level or height from the ground surface), includes a front gauge wheel unit 45 at a front lateral end of the vehicle body and a rear gauge wheel unit 46 at a rear lateral end of the vehicle body. At least one gauge wheel included in a gauge unit consisting of the front gauge wheel unit 45 and the rear gauge wheel unit 46 is shiftable to a position for bringing at least a portion of the blade housing 40 into contact with the ground surface. As at least a portion of the blade housing 40 is placed in contact with the ground surface, it is possible to restrict inadvertent movement of the mower unit 4 during a connecting operation of the mower unit 4 , which operation includes traveling of the mower to ride over the mower unit 4 .
- the intermediate structure 6 and the lift link mechanism 3 are provided as separate individual units.
- this explanation is applicable to an embodiment wherein the upper structure 9 comprised of the intermediate structure 6 and the lift link mechanism 3 integrated together functions as an attachment adaptor to the mower unit 4 .
- the configurations of the intermediate structure 6 and the lift link mechanism 3 can be freely designed.
- the present invention is not limited to the arrangement of the intermediate structure 6 and the lift link mechanism 30 being provided as separate individual units.
- FIG. 2 is a side view of a mower.
- This mower mounts a mower unit 4 between front wheels 2 a and rear wheels 2 b .
- the mower can be used also as a standard tractor, with dismounting of the mower unit 4 therefrom.
- the mower includes a water-cooled diesel engine (to the referred to simply as “engine” hereinafter) 23 mounted on a front half portion of a vehicle body frame 10 and covered by a hood 11 , and a driver's seat 21 mounted on a rear half of the vehicle body frame 10 .
- the front wheels 2 a are configured as steerable wheels operated by a steering wheel 22 and are configured as drive wheels also.
- the rear wheels 2 b too are configured as drive wheels.
- a transmission case (to be referred to as “T/M case” hereinafter) 13 is mounted on the rear half portion of the vehicle body frame 10 .
- Power from the engine 23 is transmitted via a transmission shaft (not shown) constituting a power transmission mechanism 24 to a hydrostatic stepless speed changer (to be referred to as “HST” hereinafter) 15 connected to a front portion of the T/M case 13 .
- HST hydrostatic stepless speed changer
- output from the HST 15 is transmitted to a gear speed changer (not shown) mounted inside the T/M case 13 .
- Power from the gear speed changer is divided within the T/M case 13 into a front wheel driving power and a rear wheel driving power.
- the front wheel driving power is transmitted to the front wheels 2 a via a front wheel power transmission mechanism (constituting the power transmission mechanism 24 ) extending from the T/M case 13 to the front wheels 2 a .
- the rear wheel driving power is transmitted to the rear wheels 2 b via a rear wheel power transmission mechanism (also constituting the power transmission mechanism 24 ) extending from the T/M case 13 to the rear wheels 2 b.
- the power inputted to the HST 15 is transmitted in distribution to a first PTO (Power Take-OFF) shaft 16 mounted at the rear end of the T/M case 13 and oriented rearwards and a second PTO shaft 17 mounted to the bottom portion of the T/M case 13 and oriented forwardly.
- the first PTO shaft 16 and the second PTO shaft 17 together constitute a working power transmission mechanism 25 and the second PTO shaft 17 supplies power to the mower unit 4 .
- a pair of left and right lift arms 18 vertically pivoted by an operation of a lift cylinder (not shown) provided therein and a link mechanism 19 pivotally lifted up/down in operative association with the vertical pivotal movements of these lift arms 18 .
- a lift cylinder a single-action type hydraulic cylinder is employed.
- the link mechanism 19 includes e.g. a pair of left and right lower links 19 a for allowing mounting and dismounting of a work implement (not shown) such as a rotary cultivator, a plow, etc.
- This mower has the basic arrangement of the present invention explained above with reference to FIG. 1A and FIG. 1B .
- the mower unit 4 Under the vehicle body frame 10 between the front wheels 2 a and the rear wheels 2 b , the mower unit 4 is mounted. Between the vehicle body frame 10 and the mower unit 4 , the lift link mechanism 3 and the intermediate structure 6 are disposed.
- the lift link mechanism 3 supports the mower unit 4 in suspension via the intermediate structure 6 such that the mower unit 4 can be lifted up/down.
- the intermediate structure 6 functions as an adaptor and is connected on one hand to the lift link mechanism 3 and connected on the other hand to the mower unit 4 .
- the lift link mechanism 3 includes a pair of left and right front links (pivot links) 31 assuming a rearwardly lowered inclined posture and interconnecting the front portion of the vehicle body frame 10 and the front portion of the intermediate structure 6 , and a pair of left and right rear links (pivot links) 32 assuming a rearwardly lowered inclined posture and interconnecting a longitudinal intermediate portion of the vehicle body frame 10 and the rear portion of the intermediate structure 6 .
- the mechanism 3 constitutes a parallel link mechanism for lifting up/down the mower unit 4 assuming a predetermined mowing posture, via the intermediate structure 6 .
- the left and right rear links 32 are coupled to left and right lower links 19 a of a link mechanism 19 via a coupling mechanism 34 .
- the coupling mechanism 34 includes, e.g. a rotational shaft 341 oriented in the right/left direction and rotatably attached to the vehicle body frame 10 , a pair of left and right first coupling arms 342 extending to the forward side of the vehicle body from the rotational shaft 341 and mounted to this rotational shaft 341 integrally therewith, a pair of left and right second coupling arms 343 extending upwardly of the vehicle body from the rotational shaft 341 and mounted to this rotational shaft 341 integrally therewith, a pair of left and right coupling arms 344 provided at the rear portion of the T/M case 13 , a pair of left and right coupling rods 345 for coupling the left and right first coupling arms 342 to free ends of the rear links 32 corresponding thereto, a pair of left and right coupling rods 346 for coupling the left and right second coupling arms 343 to the coupling arms 344 corresponding thereto, etc.
- a rotational shaft 341 oriented in the right/left direction and rotatably
- the left and right coupling arms 344 are pivotally mounted on support shafts 347 of the lower links 19 a corresponding thereto.
- contact pieces are formed as bent portions configured to contact one side of upper edges of the lower links 19 a of the link mechanism 19 from above.
- the mower unit 4 is connected to the vehicle body frame 10 via the lift link mechanism 3 and the intermediate structure 6 . Further, the lift link mechanism 3 is coupled to the link mechanism 19 via the coupling mechanism 34 . These arrangements enable lifting up/down of the mower unit 4 at the lower body portion of the tractor.
- the rotational shaft 341 integrally mounts a single third coupling arm 348 which extends toward the rear side of the vehicle body.
- the vehicle body frame 10 includes a lower limit setting mechanism 35 which receives the third coupling arm 348 pivoted upwards in association with a lower pivotal movement of the left and right rear links 32 , thereby to prevent a downward pivotal movement of the left and right rear links 32 .
- the lower limit setting mechanism 35 includes such components as an operational member 36 which can be operated pivotally about a vertical axis from the riding driving section, a tubular receiving portion 37 pivotable about the vertical axis together with the operational member 36 , etc. And, the lower edge of the receiving portion 37 receiving the third coupling arm 348 is formed like steps having different heights in the circumferential direction.
- the lower limit position of the left and right rear links 32 can be variably set by this lower limit setting mechanism 35 .
- the lowering limit height of the mover unit 4 relative to the vehicle body frame 10 is changed.
- FIG. 2 the lift link mechanism 3 , the intermediate structure 6 and the mower unit 4 are shown.
- the intermediate structure 6 and the mower unit 4 are connected to each other.
- FIG. 3 only the mower unit 4 is shown.
- FIG. 4 , FIG. 5 and FIG. 6 show the intermediate structure 6 connected to the lift link mechanism 3 .
- FIG. 6 shows a state wherein the front links 31 , the rear links 32 and the intermediate structure 6 are separated from each other.
- the mower unit 4 includes a vertically oriented rotational shaft 43 a for rotating three blades clockwise which are juxtaposed along the vehicle body traverse direction in a plan view, though not seen in FIG. 3 illustration, and the blade housing 40 covering these blades from above.
- the blade housing 40 includes a top plate 41 and a side plate 42 extending downwards from the circumferential edge of the top plate 41 .
- the top plate 41 of the blade housing 40 mounts a blade driving power distribution mechanism 44 .
- a transmission cover for covering from above a belt transmission mechanism 44 c of the power distribution mechanism 44 is detachably mounted, but its illustration is omitted in FIG. 3 .
- the blade housing 40 at its front end region, forms an upwardly extending bulging portion extending along the right/left direction, thereby to create a transport passage for mowed grass therein.
- a discharge cover 40 a is attached to the right end of the blade housing 40 forming a discharge outlet of this transport passage.
- this mower unit 4 is configured as a side-discharge type in which grass clippings cut by the three blades are transported through the transport passage formed inside the blade housing 40 by transporting air current generated in association with rotation of each blade and discharged through the discharge outlet at the right end of the unit 4 to the outside.
- each front gauge wheel unit 45 includes a support bracket 45 b having a vertical boss portion 45 c and a front gauge wheel 45 a mounted on an axle fixed to a sliding support shaft 45 d slidably inserted into the vertical boss portion 45 c .
- the sliding support shaft 45 d is fixed at a selected position by pin-fixing.
- the rear gauge wheel unit 46 as shown in FIG.
- the 7 in details, includes a support bracket 46 b having a vertical boss portion 46 c flipped up by a flip-up mechanism 47 , and a rear gauge wheel 46 a mounted on an axle fixed to a sliding support shaft 46 d slidably inserted into the vertical boss portion 46 c .
- the sliding support shaft 46 d too is fixed at a selected position by pin-fixing.
- the flip-up mechanism 47 in this embodiment, is configured to retain a vertical posture of the sliding support shaft 45 d by retaining, by a spring-urged pivot arm, the vertical boss portion 46 c supported to the support bracket 46 b to be pivotable about a horizontal axis (see FIG.
- this flip-up mechanism 47 has a function of flipping up the rear gauge wheel 46 a , by releasing the spring urging.
- the rear gauge wheel 46 a is flipped up, the lower end of the side plate 42 of the blade housing 40 comes into contact with the ground surface. With this, a large frictional force is applied between the blade housing 40 and the ground surface, so that even in the event of application of an external force thereto, movement of the blade housing 40 is restricted.
- the power distribution mechanism 44 includes an input shaft (a constituent of the mower side power transmission mechanism 25 B) extending rearwards from a housing 44 a disposed at the center of the blade housing 40 , and the belt transmission mechanism 44 c for transmitting the power received by the input shaft 44 b in distribution to three rotational shafts 43 a to which the blades 43 are fixed respectively.
- This intermediate structure 6 has a framework consisting of a first member 61 and a second member 62 which extend in the vehicle body front/rear direction with forming a space therebetween, a front connecting member 63 interconnecting front portions of the first member 61 and the second member 62 , and a rear connecting member 64 interconnecting rear portions of the first member 61 and the second member 62 .
- the front connecting member 63 is a bar-like member having a convex portion at the center thereof, and at this convex portion, a hook-like free end of the front link 31 of the lift link mechanism 3 is pivotally retained.
- the free end of the rear links 32 of the lift link mechanism 3 are pivotally pin-connected via link pins 39 .
- each engaging portion 610 includes a vehicle body side first front guide 611 provided as a bent portion formed in the region of the first member 61 connected to the connecting member 63 , a vehicle body side second front guide 612 provided as a bent portion formed in the region of the second member 62 connected to the connecting member 63 , a vehicle body side first rear guide 613 provided as an outwardly projecting bracket-like member disposed at the rear end of the first member 61 , and a vehicle body side second rear guide 614 provided as an outwardly projecting bracket-like member disposed at the rear end of the first member 61 .
- Each engaged portion 620 includes a mower side first guide 621 and a mower side second front guide 622 which are disposed erect at the front region of the top plate 41 in distribution on the left and right sides, and a mower side first rear guide 623 and a mower side second rear guide 624 which are disposed erect at the rear region of the top plate 41 in distribution on the left and right sides.
- the mower side first front guide 621 and the vehicle body side first front guide 611 , the mower side second front guide 622 and the vehicle body side second front guide 612 , the mower side first rear guide 623 and the vehicle body side first rear guide 613 , the mower side second rear guide 624 and the vehicle body side second rear guide 614 , are disposed respectively at mutually engaging positions, under the interconnected state of the intermediate structure 6 and the blade housing 40 .
- the vehicle body side first front guide 611 and the vehicle body side second front guide 612 respectively include an engaging pin 69 A extending horizontally in an obliquely forward direction.
- the vehicle body side first rear guide 613 and the vehicle body side second rear guide 614 respectively include an elongate slot 69 C extending horizontally in an oblique direction and opened to the front side.
- the mower side first front guide 621 and the mower side second front guide 622 respectively include an elongate slot 69 B extending horizontally in an oblique direction and opened to the rear side.
- a rotational operation shaft 80 for a locking mechanism 8 to be described in details later extends in the vehicle body transverse direction (transverse direction).
- This rotational operation shaft 80 functions as an engaging pin engageable with the elongate slots 69 C of the vehicle body side first rear guide 613 and the vehicle body side second rear guide 614 .
- the vehicle body side first front guide 611 , the vehicle body side second front guide 612 , the vehicle body side first rear guide 613 , the vehicle body side second rear guide 614 , and the mower side first front guide 621 , the mower side second front guide 622 , the mower side first rear guide 623 , the mower side second rear guide 624 respectively include an inclined face which extends closer to a vehicle body longitudinal centerline as it extends forwardly. And, the respective corresponding inclined faces are formed so as to come into contact with each other substantially, under the interconnected state of the intermediate structure 6 and the blade housing 40 .
- these inclined faces function as “guide faces” for guiding the intermediate structure 6 to the position for connection with the mower housing 40 as the mower travels forwardly relative to the blade housing 40 placed on the ground surface. That is, the engaging portions 610 of the intermediate structure 6 and the engaged portions 620 of the blade housing 40 respectively include a guide face as an inclined face, and these guide faces come into contact with each other in association with a movement in the vehicle body front/rear direction.
- the second PTO shaft 17 transmits power to the input shaft 44 b (see FIG. 6 ) of the power distribution mechanism 44 of the mower unit 4 , and the working power transmission mechanism 25 disposed therebetween is divided into the vehicle body side power transmission mechanism 25 A and the mower side power transmission mechanism 25 B. These mechanisms can be connected to or disconnected from each other by the power coupling mechanism 7 provided in the intermediate structure 6 .
- the mower side power transmission mechanism 25 B includes a first universal joint 25 b and the input shaft 44 b .
- the vehicle body side power transmission mechanism 25 A includes a relay shaft 25 a , the first universal joint 25 b and a second universal joint 25 c .
- the first universal joint 25 b interconnects the second PTO shaft 17 and the relay shaft 25 a .
- the second universal joint 25 c interconnects the relay shaft 25 a functioning as an output shaft of the vehicle body side power transmission mechanism 25 A and the input shaft 44 b functioning as an input shaft of the mower side power transmission mechanism 25 B.
- This second universal joint 25 c includes a spline-type connecting portion enabling connection to and disconnection from the input shaft 44 b .
- the mechanism for effecting these connection and disconnection is the power coupling mechanism 7 .
- the disconnecting state of the power coupling mechanism 7 is shown in FIG. 9 and its connecting state is shown in FIG. 10 .
- the power coupling mechanism 7 includes a coupling body 70 which is provided as the second universal joint 25 c in this embodiment, a coupling holding portion 73 configured to hold the coupling body 70 by surrounding it and holding it via an inner circumferential face thereof, and an attaching unit 75 for attaching the coupling holding portion 73 to the intermediate structure with allowing displacement of the coupling holding portion 73 in the vehicle body front/rear direction.
- the coupling body 70 includes a first connecting end 71 to be connected to the relay shaft 25 a and a second connecting end 72 to be connected to the input shaft 44 b .
- the second connecting end 72 has an inner circumferential face formed with a spline engageable with the spline formed on the input shaft 44 b .
- the coupling holing portion 73 is a boss member having projections at opposed ends thereof. And, the coupling body 70 is fixed within a boss hole of this boss member. As the coupling holding portion 73 is moved toward the input shaft 44 b of the power distribution mechanism 44 , the input shaft 44 b and the second connecting end 72 are spline-engaged with each other.
- the attaching unit 75 is provided for realizing such movement of the coupling holding portion 73 . To this end, the attaching unit 75 is configured as a slider mechanism for moving the coupling holding portion 73 . As a force (e.g.
- first leg portion 75 a and a second leg portion 75 b as a pair of slider rods, and guide holes as slide guides for the respective slider rods.
- the first leg portion 75 a is a bar-like member fixed to the left end of the coupling holding portion 73 and extending rearwards therefrom.
- the second leg portion 75 b is a bar-like member fixed to the right end of the coupling holding portion 73 and extending rearwards therefrom.
- the guide holes are through holes formed in a first bracket 65 a and a second bracket 65 b provided in the first member 61 and the second member 62 , respectively, as will be described later herein.
- the first leg portion 75 a and the second leg portion 75 b are inserted into these through holes, thus being slidably supported to the first bracket 65 a and the second bracket 65 b .
- the attaching unit 75 is supported to the first member 61 and the second member 62 , that is, to the intermediate structure 6 .
- the attaching unit 75 can be supported to the vehicle body 1 , e.g. to the vehicle body frame 10 .
- the intermediate structure 6 includes the first bracket 65 a having a U-shape in its plan view and having its end connected to the first member 61 and extending toward the second member 62 , and the second bracket 65 b having a U-shape in its plan view and having its end connected to the second member 62 and extending toward the first member 61 . Between the leading end of the first bracket 65 a and the leading end of the second bracket 65 b , there is formed a gap through which the relay shaft 25 a can pass. Further, the first bracket 65 a defines, in its leading end region, a hole in which the first leg portion 75 a is inserted and the second bracket 65 b defines, in its leading end region, a hole in which the second leg portion 75 b is inserted.
- first leg portion 75 a and the second leg portion 75 b are supported to the attaching unit 75 to be movable in the vehicle body front/rear direction.
- the coupling holding portion 73 is moved together with the attaching unit 75 to a predetermined connecting position toward the input shaft 44 b of the power distribution mechanism 44 under the interconnected state of the intermediate structure 6 and the blade housing 40 , spline connection is established between the second connecting end 72 of the coupling body (the second universal joint 25 c ) and the input shaft 44 b.
- springs 76 are disposed for providing an urging force to release connection between the coupling body 70 held to the coupling holding portion 73 and the input shaft 44 b of the power distribution mechanism 44 . Accordingly, when the locking mechanism 8 is pivoted in the direction for releasing lock, the coupling body 70 is automatically withdrawn from the input shaft 44 b .
- FIG. 9 and FIG. 10 illustrate that between the first leg portion 75 a of the power distribution mechanism 44 and the first bracket 65 a and also between the second leg portion 75 b of the mechanism 44 and the second bracket 65 b .
- FIG. 9 there is shown an expanded state of the spring 76 , that is, a state prior to establishment of spline-engagement between the input shaft 44 b and the second connecting portion 72 .
- FIG. 10 there is shown a compressed state of the spring 76 , that is, a state after establishment of the spline-engagement between the input shaft 44 b and the second connecting portion 72 .
- the locking mechanism 8 includes a first locking mechanism 8 A for locking the coupling holding portion 73 at the connecting position and a second locking mechanism 8 B for locking the engaging portions 610 and the engaged portions 620 at the mutually engaged positions.
- the first locking mechanism 8 A and the second locking mechanism 8 B include a common rotational operation shaft 80 .
- this rotational operation shaft 80 extends in the vehicle body traverse direction in the rear end region of the top plate 41 of the blade housing 40 and is rotatably supported by a plurality of bearing stands.
- the rotational operation shaft 80 includes two first acting portions 81 for the first locking mechanism 8 A and two second acting portions 82 for the second locking mechanism 8 B.
- the first acting portions 81 are provided as arms configured to come into contact with the contacting portions provided at the rear ends of the first leg portion 75 a and the second leg portion 75 b of the power coupling mechanism 7 in association with rotation of the rotational operation shaft 80 to press the coupling holding portion 73 to the connecting position and holding this connecting position.
- the second acting portions 82 are provided as hook-like arms configured to come into contact with a pin-like projection 61 a provided in the first member 61 and a pin-like projection 62 a provided in the second member 62 and to hold these projections therein, thus retaining the engaging portions 610 and the engaged portions 620 at the engaging positions thereof, whereby the interconnection between the intermediate structure 6 and the blade housing 40 is retained.
- a rod-like operational arm 83 extending to the periphery of the driver's seat 21 .
- the mower when the mower unit 4 is to be mounted to the vehicle body 1 , the mower is caused to travel forwardly to ride over the mower unit 4 placed laterally on the ground surface.
- the blade housing 40 includes a ride-over mechanism 5 .
- This ride-over mechanism 5 as shown in FIG. 3 and FIG. 11 , is provided for each one of the left and right front wheels 2 a . And, the distance between the mechanisms 5 corresponds to the front-wheel tread width.
- Each ride-over mechanism 5 includes a bridge portion 50 extending along the front/rear direction upwardly of the belt transmission mechanism 44 c mounted to the top plate 41 of the blade housing 40 , a front auxiliary plate 51 extending with an inclination from the front end of the bridge portion 50 toward the ground surface, and a rear auxiliary plate 52 extending with an inclination from the rear end of the bridge portion 50 toward the ground surface.
- the bridge portion 50 consists of a pair of arch-shaped rods having a flat intermediate portion, and a stepping plate disposed on the top faces of the intermediate portions of the pair of rods. Further, to opposed sides of the bridge portion 50 , side plates 53 are attached.
- the front auxiliary plate 51 and the rear auxiliary plate 52 are configured as slide type, so that these plates are retracted within the bridge portion 50 when out of use.
- This slide-type storage is realized by a guide pin 51 a provided at the rear end of the front auxiliary plate 51 and a guide pin 52 a and guide slits 53 a provided at the front end of the rear auxiliary plate 52 .
- the guide slits 53 a are formed in the respective side plates 53 substantially horizontally in the front/rear direction so as to respectively guide the guide pin 51 a and the guide pin 52 a inserted therein during the movement. But, these guide slits 53 a are formed vertical at terminal ends thereof so as to retain the inclined postures of the front auxiliary plate 51 and the rear auxiliary plate 52 in a reliable manner, when the pins are withdrawn therefrom.
- the intermediate structure 6 is lowered in advance to its lower limit position by an operation of the lift link mechanism 3 .
- the vehicle body 1 is caused to travel forwardly so that the front wheels 2 a move above the blade housing 40 to ride over this housing with utilizing the ride-over mechanism 5 from the rear side of the mower unit 4 .
- the engaging portions 610 (the four guides 611 - 614 provided on the front, rear, left and right sides) provided in the intermediate structure 6 come into engagement with the engaged portions 620 (the four guides 621 - 624 provided on the front, rear, left and right sides) provided in the blade housing 40 .
- the engaging pins 69 A provided in the vehicle body side first front guide 611 and the vehicle body side second front guide 612 are guided by the respective guide faces 630 and enter the elongate slots 69 B provided in the mower side first rear guide 613 and the mower side second rear guide 614 .
- the vehicle body side first rear guide 613 and the vehicle body side second rear guide 614 come into face contact with the mower side first rear guide 623 and the mower side second rear guide 624 , respectively and move into the regions restricted by these mower side first rear guide 623 and mower side second rear guide 624 .
- the axis of the coupling body 70 of the power coupling mechanism 7 provided in the intermediate structure 6 is positioned.
- the input shaft 44 b and the coupling body 40 are aligned on the same axis in the vehicle body front/rear direction.
- the driver operates the operational arm 83 of the locking mechanism 8 to rotate the rotational operation shaft 80 (see FIG. 13 and FIG. 14 ).
- the arms constituting the first acting portions 81 of the locking mechanism 8 press the rear ends (contacting portions) of the first leg portion 75 a and the second leg portion 75 b of the power coupling mechanism 7 provided in the intermediate structure 6 , thereby to move the coupling holding portion 73 together with the coupling body 70 , thus establishing interconnection between the input shaft 44 b and the coupling body 70 (see FIG. 16 ).
- the two hook-like arms constituting the second acting portions 82 rotate and surround the pin-like projection 61 a provided in the first member 61 and the pin-like projection 62 a provided in the second member 62 .
- the final engaged state between the engaging portions 610 and the engaged portions 620 is established. That is, according to the instant embodiment, the vehicle body side first front guide 611 and the mower side first front guide 621 , the vehicle body side second front guide 612 and the mower side second front guide 622 , the vehicle body side first rear guide 613 and the mower side first rear guide 623 , the vehicle body side second rear guide 614 and the mower side second rear guide 624 respectively are rendered to the respective engaged states.
- a locking device 84 for locking the rotational operation shaft 80 at its engaging rotational position is provided at the interconnecting position between the operational arm 83 and the rotational operation shaft 80 .
- the construction of this locking device 84 per se is well-known, thus detailed illustration thereof is omitted herein. Referring only briefly thereto, in this embodiment, the rotational operation shaft 80 is locked as a lock pin enters a lock hole at the engaging rotational position. And, as the lock pin moves out of the lock hole, locking of the rotational operation shaft 80 is released. Needless to say, any other locking arrangement can be employed also.
- the lift link mechanism 3 For dismounting the mower unit 4 from the vehicle body 1 , the lift link mechanism 3 is lowered so as to place the mower unit 4 onto the ground surface. Then, the driver operates the operational arm 83 of the locking mechanism 8 to rotate the rotational operation shaft 80 of the locking mechanism 8 to a locking release position. In response to this, the connection between the input shaft 44 b and the coupling body 70 is released. In succession, the vehicle body 1 is caused to travel in reverse so that the front wheels 2 a move above the blade housing 40 to ride over this housing with utilizing the ride-over mechanism 5 from the front side of the mower unit 4 .
- the engaging portions 610 (the four guides 611 - 614 provided on the front, rear, left and right sides) provided in the intermediate structure 6 move out of the engaged portions 620 (the four guides 621 - 624 provided on the front, rear, left and right sides) provided in the blade housing 40 .
- the mower unit is released, so that this unit can be carried out freely.
- FIGS. 17A and 17B differs from that shown in FIGS. 1A and 1B in that an operational tool 830 is provided in the arrangement shown in FIGS. 1A and 1B .
- the blade power transmission mechanism (working power transmission mechanism) 25 connectable to and disconnectable from a mower unit side shaft member and a vehicle body side shaft member in order to transmit rotational power of the engine 23 mounted on the mower to the blades 43 mounted to the blade housing 40 is rendered into a connected state for allowing the power transmission by using the operational tool 830 .
- the coupling body 70 acting as an output shaft of the vehicle body side power transmission mechanism 25 A is relatively displaced, preferably linearly moved, between a connecting position realizing interconnection between the machine body side power transmission mechanism 25 A and the mower side power transmission mechanism 25 B and a releasing position realizing disconnection therebetween.
- This relative displacement is effected manually with using the operational tool 830 .
- Its operational force can use also a power of an electric motor, an electric cylinder, a hydraulic cylinder, etc. instead of the manual force.
- FIG. 18 is a side view of a mower. As many parts thereof are identical to those of the first embodiment explained above with reference to FIGS. 1-16 , the following explanation will focus on difference from the first embodiment.
- FIG. 20 , FIG. 21 and FIG. 22 show a lift link mechanism 3 and an intermediate structure 6 in the second embodiment. The basic configurations thereof are identical to those of the first embodiment.
- a power coupling mechanism 7 includes a coupling body 70 as a second universal joint 25 c , a coupling holding portion 730 surrounding the coupling body 70 and holding this coupling body 70 via its inner circumferential face, and an attaching unit 75 for attaching this coupling holding portion 730 to the intermediate structure, with allowing displacement of the portion 730 in the vehicle body front/rear direction.
- the coupling body 70 includes a first connecting end 71 to be connected to the relay shaft 25 a and a second connecting end 72 to be connected to the input shaft 44 b .
- the second connecting end 72 has an inner circumferential face formed with a spline engageable with the spline formed on the input shaft 44 b .
- the coupling holding portion 730 is a plate-like boss member having extension pieces at opposed ends thereof. And, the coupling body 70 is fixed within a boss hole of this plate-like boss member. As the coupling holding portion 730 is moved toward the input shaft 44 b of the power distribution mechanism 44 , the input shaft 44 b and the second connecting end 72 are spline-engaged with each other.
- the attaching unit 75 is provided for realizing such movement of the coupling holding portion 730 .
- the attaching unit 75 is configured as a slider mechanism for moving the coupling holding portion 730 .
- a force e.g. an operational force by a driver
- the coupling holding portion 730 is moved, thus realizing the connection of the power coupling mechanism 7 .
- a first leg portion 751 and a second leg portion 752 as a pair of slider rods, and guide holes as slide guides for the respective slider rods.
- the first leg portion 751 is configured as a bar-like member fixed to the left side extension of the coupling holding portion 730 and extending rearwards therefrom.
- the second leg portion 752 is configured as a bar-like member fixed to the right side extension piece of the coupling holding portion 730 and extending rearwards therefrom.
- the rear ends of the first leg portion 751 and the second leg portion 752 are interconnected via a connecting plate 753 .
- the attaching unit 75 includes, as bases, a first base plate 651 fixed to the first member 61 and a second base plate 652 fixed to the second member 62 .
- a first bracket 653 and a second bracket 654 are fixed, respectively. Between the first bracket 653 and the second bracket 654 , there is formed a gap allowing passage of the relay shaft 25 a therethrough.
- the first bracket 653 and the second bracket 654 respectively is configured as a C-shaped bent plate in its plan view and through holes are formed at its opposed end regions. These through holes function as guide holes for the first leg portion 751 and the second leg portion 752 . More particularly, the first leg portion 751 and the second leg portion 752 are inserted in the through holes formed coaxially at the opposed ends of the first bracket 653 and the second bracket 654 and slidably supported to the first bracket 653 and the second bracket 654 .
- An arch-shaped cover 656 is provided for partially covering, from above, the second universal joint 25 c provided on the relay shaft 25 a connected to the input shaft 44 b of the mower side power transmission mechanism 25 B. This arch-like cover 656 is shown as being removed in the illustrations of FIG. 26 and FIG. 27 , but it is shown as being attached in the illustrations of FIG. 24 and FIG. 25 .
- the operational lever 830 selectively providing the connected state and the disconnected state of the power transmission mechanism 7 is configured as an operational lever 830 pivotable about a pivotal vertical axis Pa as shown in FIG. 26 , and a slit 831 is formed at one end thereof. And, in this slit 831 , a pin 832 fixed to the second leg portion 752 is inserted.
- the coupling body 70 is moved in the front/rear direction. With this, connection (splined connection) of the coupling body 70 acting as the output shaft of the vehicle body side power transmission mechanism 25 A and the input shaft 44 b or disconnection thereof from the input shaft 44 b are realized.
- springs 76 are provided for urging in the direction of releasing the connection of the coupling body 70 held to the coupling holding portion 73 and the input shaft 44 b of the power distribution mechanism 44 .
- a stopper plate 833 configured to hold the operational lever 830 at its pivotal position for interconnecting the coupling body 70 and the input shaft 44 b .
- This stopper plate 833 forms a cutout portion 834 which has a substantially same width as the operational lever 830 and which is opened downwards.
- This cutout portion 834 is configured to maintain the operational lever 830 at the pivotal position for interconnecting the coupling body 70 and the input shaft 44 b .
- the operational lever 830 and the cutout portion 834 constitute the first locking mechanism 8 A as one of the locking mechanism 8 .
- This locking mechanism 8 for locking mounting of the mower unit 4 to the vehicle body 1 .
- This locking mechanism 8 includes the first locking mechanism 8 A for locking the coupling holding portion 73 at the connecting position and the second locking mechanism 8 B for locking the engaging portions 610 and the engaged portions 620 at the respective engaged positions.
- the first locking mechanism 8 A and the second locking mechanism 8 B are operatively coupled to each other via lock coupling link 840 , as may be understood from FIG. 24 , FIG. 25 and FIG. 26 .
- a rotational operation shaft 880 is rotatably mounted between the rear end portion of the first member 61 and the rear end portion of the second member 62 of the intermediate structure 6 and on the front side of the rear connecting member 64 and parallel with this rear connecting member 64 .
- a rotational operation shaft 880 is rotatably mounted on this rotational operation shaft 880 .
- a pair of left and right locking engagement pieces 820 are fixed with a spacing therebetween.
- a connecting arm 841 is fixed.
- the connecting arm 841 is link-connected to the connecting plate 655 via the lock coupling link 840 .
- the locking engagement pieces 820 are configured as hook-like arms, so that in association with rotation of the rotational operation shaft 880 , these pieces 820 engage with the lock fixing rod 800 fixed to the blade housing 40 .
- a pivotal displacement of the operational lever 80 establishing interconnection between the coupling body 70 functioning as the output shaft of the vehicle body side power transmission mechanism 25 A and the input shaft 44 b is converted into a rotational displacement for engaging the locking engagement pieces 820 to the lock fixing rod 800 .
- the operational lever 830 and a slit 844 formed in the stopper plate 833 together constitute the first locking mechanism 8 A as one component of the locking mechanism 8
- the locking engagement pieces 820 , the lock fixing rod 800 and the lock coupling link 840 together constitute the second locking mechanism 8 B.
- the mower unit 4 When the mower unit 4 is to be mounted to the vehicle body 1 , the mower is caused to travel forwardly to ride over the mower unit 4 placed laterally on the ground surface.
- the blade housing 40 includes a ride-over mechanism 5 .
- This ride-over mechanism 5 as shown in FIG. 19 and FIG. 24 , is provided for each one of the left and right front wheels 2 a . And, the distance between the mechanisms 5 corresponds to the front-wheel tread width.
- Each ride-over mechanism 5 includes a bridge portion 500 extending along the front/rear direction upwardly of the belt transmission mechanism 44 c mounted to the top plate 41 of the blade housing 40 , a front auxiliary plate 510 extending with an inclination from the front end of the bridge portion 500 toward the ground surface, and a rear auxiliary plate 520 extending with an inclination from the rear end of the bridge portion 500 toward the ground surface.
- the bridge portion 500 consists of a pair of arch-shaped frames having a flat intermediate portion and its cross section is formed like an upwardly opened channel. When not in use, the front auxiliary plate 510 and the rear auxiliary plate 520 are retracted and stored within the bridge portion 500 .
- the front auxiliary plate 510 and the second auxiliary plate 520 respectively include, at one end thereof, pins 511 and 521 projecting in the traverse direction. And, at front end and rear end of the bridge portion 500 , there are formed cutouts 501 for receiving these pins 511 and 521 .
- the front auxiliary plate 510 and the rear auxiliary plate 520 are inclined to orient their pins 511 and 521 upwards and these pins 511 , 521 are inserted into the cutouts 501 .
- the orientations of the front auxiliary plate 510 and the rear auxiliary plate 520 are reversed and these plates 510 and 520 are stored within the bridge portion 500 and also the pins 511 and 521 are inserted into the cutouts 501 .
- the intermediate structure 6 is lowered in advance to its lower limit position by an operation of the lift link mechanism 3 .
- the vehicle body 1 is caused to travel forwardly so that the front wheels 2 a move above the blade housing 40 to ride over this housing with utilizing the ride-over mechanism 5 from the rear side of the mower unit 4 .
- the engaging portions 610 (the four guides 611 - 614 provided on the front, rear, left and right sides) provided in the intermediate structure 6 come into engagement with the engaged portions 620 (the four guides 621 - 624 provided on the front, rear, left and right sides) provided in the blade housing 40 .
- the engaging pins 69 A provided in the vehicle body side first front guide 611 and the vehicle body side second front guide 612 are guided by the respective guide faces 630 and enter the elongate slots 69 B provided in the mower side first front guide 621 and the mower side second front guide 622 .
- the vehicle body side first rear guide 613 and the vehicle body side second rear guide 614 come into face contact with the mower side first rear guide 623 and the mower side second rear guide 624 , respectively and move into the regions restricted by these mower side first rear guide 623 and mower side second rear guide 624 .
- the vehicle body 1 is stopped.
- the axis of the input shaft 44 b extending rearwards in the vehicle body front/rear direction of the power distribution mechanism 44 of the mower unit 4 .
- the axis of the coupling body 70 of the power coupling mechanism 7 provided in the intermediate structure 6 is positioned.
- the input shaft 44 b and the coupling body 40 are aligned on the same axis in the vehicle body front/rear direction.
- the driver pivotally operates the operational lever 830 to engage this operational lever 830 into the slit 831 .
- This pivotal displacement realizes interconnection between the coupling body 70 functioning as an output shaft of the vehicle body side power transmission mechanism 25 A and the input shaft 44 b , and this state is maintained by the function of the first locking mechanism 8 A and the above displacement realizes, on the other hand, engagement of the locking engagement piece 820 to the locking fixing rod 800 , and this state is maintained by the function of the second locking mechanism 8 B.
- the lift link mechanism 3 For dismounting the mower unit 4 from the vehicle body 1 , the lift link mechanism 3 is lowered so as to place the mower unit 4 onto the ground surface. Then, the driver operates the operational lever 830 to remove it from the slit 831 .
- the operational lever 830 disengaged from the slit 831 is pivoted to its home position by the resilience of the spring 76 . This pivotal displacement realizes, on one hand, disconnection between the coupling body 70 functioning as an output shaft of the vehicle body side power transmission mechanism 25 A and the input shaft 44 b , and realizes, on the other hand, disengagement of the locking engagement piece 820 from the locking fixing rod 800 . As a result, the interconnection between the blade housing 40 and the intermediate structure 6 is released.
- the vehicle body 1 is caused to travel in reverse so that the front wheels 2 a move above the blade housing 40 to ride over this housing with utilizing the ride-over mechanism 5 from the front side of the mower unit 4 .
- the engaging portions 610 provided in the intermediate structure 6 move out of the engaged portions 620 provided in the blade housing 40 .
- the mower unit 4 is released, so that this unit can be carried out freely.
- the engagement arrangement for interconnecting the intermediate structure 6 and the blade housing 40 consisting of the engaging portions 610 included in the intermediate structure 6 and the engaged portions 620 included in the blade housing 40 can be of any other engagement arrangement form than the hole-pin engagement described above, e.g. pawl engagement arrangement, as long as such other arrangement too realizes engagement in association with approaching in the vehicle body front/rear direction with forward traveling of the vehicle body 1 and disengagement in association with departing in the vehicle body front/rear direction with reverse traveling of the vehicle body 1 . Further alternatively, these different engagement arrangements can be used in combination. Also, in the foregoing embodiment, the number of the engaging connecting points created by the engaging portions 610 and the engaged portions 620 was four. However, it can be any number of two or more.
- the mower unit 4 can be configured as a rear-discharge type in which grass clippings are discharged rearwards from a discharge opening formed at the rear end of the blade housing 40 . Further alternatively, the mower unit 4 can be mulching type in which grass clippings cut by the blade are minced while being circulated inside the blade housing 40 and then dropped through an opening formed in the bottom of the blade housing 40 onto the ground surface. Furthermore, the number of blades to be provided in the mid-mount mower unit 4 and the transmission arrangement for the blade can vary in many ways.
- FIG. 27 and FIG. 28 show a further embodiment of an attaching unit 75 configured to move the coupling body 40 back and forth.
- a first side plate 7501 and a second side plate 7502 are fixed to the opposed ends of the coupling holding portion 73 and extending in the front/rear direction. End portions of the first side plate 7501 and the second side plate 7502 corresponding to the coupling holding portion 73 are interconnected via an interconnecting plate 7503 .
- the first base plate 651 forms a first guide plate 657 instead of the first bracket 653 and the second base plate 652 forms a second guide plate 658 instead of the second bracket 654 .
- the first guide plate 657 is fixed in position so as to contact the first side plate 7501
- the second guide plate 658 is fixed in position so as to contact the second side plate 7502
- the first side plate 7501 and the second side plate 7502 respectively form guide grooves 7504 extending in the front/rear direction
- the first guide plate 657 and the second guide plate 658 respectively include guide pins 755 engageable into the guide grooves 7504 respectively. That is, with a guiding function of the guide grooves 7504 and the guide pins 755 , the coupling body 70 is moved back and forth.
- the leading end of the operational lever 830 is connected to the first side plate 7501 .
- the first side plate 7501 and the second side plate 7502 In response to a pivotal displacement of the operational lever 830 , the first side plate 7501 and the second side plate 7502 , eventually, the coupling body 70 , are (is) moved back and forth.
- the lock coupling link 840 too is connected to the first side plate 7501 .
- the present invention is applicable to a mower detachably mounting, between front wheels and rear wheels, a mower unit 4 of various types configured to be capable of being ridden over by the left and right front wheels.
- the configurations of the lift link mechanism and the mower unit 4 are not particularly limited in the present invention.
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Abstract
A mid-mount mower has a mower unit mounted under a vehicle body between front wheels and rear wheels. The mower includes a lift link mechanism having a front link and a rear link, an intermediate structure interconnecting one end of the front link and one end of the rear link via a pivot axis, a blade housing having an engaged portion engageable with an engaging potion of the intermediate structure and a guide face configured to guide the engaging portion ad the engaged portion to an engaging position so as to establish connection between the blade housing placed on a ground surface and the intermediate structure in association with a movement of the vehicle body in a front/rear direction.
Description
- 1. Field of the Invention
- The present invention relates to a mid-mount mower having a mower unit disposed under a vehicle body between front wheels and rear wheels.
- 2. Description of the Related Art
- In a mid-mount mower, a blade housing covering a rotary blade is connected to a lift link mechanism having a front link and a rear link attached to a vehicle body and spaced apart from each other in a vehicle front/rear direction. With this, the blade housing can be lifted up/down between a lowered working position and an elevated non-working position. When a maintenance/inspection of the mower unit or an operation other than a grass mowing operation is to carried out, the mower unit is dismounted from the vehicle body. It is very troublesome to carry out a connecting/disconnecting operation thereof in a limited space between the front wheels and the rear wheels. For this reason, it has been proposed to carry out at least some steps of the connecting/disconnecting operation in an automated manner.
- For instance, in the case of a mid-mount mower disclosed in Japanese Unexamined Utility Model Application Publication No. 4-110428 (FIG. 1, FIG. 3) (Patent Document 1), in association with a forward traveling of the vehicle body, left and right front wheels roll over a blade housing, with utilizing a front wheel guide plate of this blade housing, to be positioned eventually at the body portion of a tractor. Then, in association with a final forward traveling, connection pins provided at free ends of a pair of left and right rear links are guided by openings formed at hook portions of a pair of left and right support stays provided in the blade housing and engaged into the deepest parts thereof. Then, lock arms provided in the respective support stays come into engagement with the connection pins with spring action, thus retaining the connection pins against inadvertent removal thereof, whereby the respective connection pins provided on the side of the vehicle body are connected to the respective support stays provided on the side of the mower. Thereafter, with establishment of connection between the front link and the front-side support stays, the connecting operation is completed. With the connecting arrangement disclosed in this
Patent Document 1, connection of the front link needs to be carried out manually after connection of the rear link. After the connection pins of the pair of left and right rear links are guided by the openings of the hook portions of the blade housing and engaged into the deepest parts thereof, connection is established between the vehicle body and the blade housing. Simultaneously, engagement is established also between a clutch driving member of the vehicle body and a clutch driven member of the blade housing, thus enabling power transmission from the vehicle body to the blade housing. Under this condition, as lock arms provided in the respective support stays come into engagement with the connection pins by a spring action, thereby to retain the connection pins against inadvertent removal thereof, the respective pins of the vehicle body are connected to the respective support stays of the mower. Thereafter, with establishment of connection between the front links and the front-side support stays, the connecting operation is completed. In this way, in the case of the connecting arrangement disclosed in thisPatent Document 1, connection between the vehicle body and the blade housing and connection for power transmission are effected simultaneously. - In Japanese Unexamined Patent Application Publication No. 10-339169 (FIG. 3, FIG. 4), there is disclosed an arrangement in which a hitch pin provided in a front link and a hitch pin provided in a rear link are automatically connected simultaneously with front and rear hitch brackets (support stays) provided in a mower deck (blade housing). However, with this arrangement, in the hitch brackets, there are only formed elongate holes opened along the vehicle body front/rear direction. Thus, for this connecting operation, a high-precision positioning is required between the mower deck and the vehicle body. Further, as an automatic connection arrangement relative to the mower deck is incorporated in a lift link mechanism, restriction is imposed on the designing of the structure of the lift link mechanism. For this reason, this automatic connection arrangement cannot be directly retrofitted with a conventional existing lift link mechanism. Moreover, with this connection arrangement, three points of the front-side hitch pin, the rear-side hitch pin and an output shaft side coupling need to be positioned with precision in three-dimensional manner with three points of the front-side hitch bracket, the rear-side hitch bracket and an input shaft side coupling, respectively. Hence, this connecting operation is difficult.
- The U.S. Pat. No. 7,877,972 (FIG. 2, FIG. 4) and the U.S. Pat. No. 823,487 (FIG. 2, FIG. 4) too disclose automatic connection arrangements between a lift link mechanism and a mower deck (blade housing), including an automatic connection of power transmission paths. However, in these arrangements too, the automatic connection arrangement for the mower deck is integrally incorporated in the lift link mechanism. This results in specialization or peculiarity of the link mechanism per se. Thus, when this automatic connection arrangement is employed, it is difficult to use a conventional lift link mechanism without any modification thereof. Further, as connection between the vehicle body and the blade housing and connection for power transmission need to be established simultaneously, a high skill and/or experience is required for the connecting operation.
- In view of the above-described states of the art, there is a need for a mid-mount mower allowing facilitated connection arrangement between a vehicle body and a mower unit and connection arrangement of power transmission mechanism from the vehicle body to the mower unit and providing high reliability in effecting both of these connections. In accomplishing this object, it is also desired not to impose any substantial structural restraint on a conventional existing lift link mechanism.
- According to one exemplary inventive mid-mount mower having a mower unit mounted under a vehicle body between front wheels and rear wheels, the mower comprises:
- a lift link mechanism having a front link and a rear link provided in the vehicle body and spaced apart from each other in a vehicle body front/rear direction;
- an intermediate structure interconnecting one end of the front link and one end of the rear link via a pivot axis;
- a blade housing having an engaged portion engageable with an engaging portion of the intermediate structure; and
- a guide face configured to guide the engaging portion and the engaged portion to an engaging position in association with a movement of the vehicle body in the vehicle body front/rear direction so as to establish connection between the blade housing placed on a ground surface and the intermediate structure.
- With the above arrangement, for realization of automatic connection of the blade housing to the lift link mechanism, there is provided an intermediate structure for mediating establishment of this connection between the link mechanism and the blade housing. Relative to the lift link mechanism, this intermediate structure is only connected pivotally to one end of the front link and one end of the rear link, which links together constituting the lift link mechanism. And, the engaging portion and the engaged portion used for automatic connection with the blade housing are provided in the intermediate structure and the blade housing, respectively. Therefore, essentially, it is also possible to use a conventional existing lift link mechanism as it is. Further, positioning or alignment between the engaging portion and the engaged portion at the time of connection establishment is guided by the guide face. Thus, a certain amount of positioning error can be tolerated in the movement of the vehicle body in the front/rear direction, so that the trouble for the driver of the vehicle body can be alleviated.
- According to another exemplary inventive mid-mount mower having a mower unit mounted under a vehicle body between front wheels and rear wheels, the mower comprises:
- a lift link mechanism having a front link and a rear link and configured to suspend the mower unit;
- a blade housing having an engaged portion engageable with an engaging portion provided in the vehicle body in association with a movement of the vehicle body in a vehicle body front/rear direction;
- a blade power transmission mechanism having a vehicle body side power transmission mechanism and a mower side power transmission mechanism as units separate from each other and having also a power coupling mechanism for coupling an output shaft of the vehicle body side power transmission mechanism with an input shaft of the mower side power transmission mechanism; and
- a coupling operational tool for establishing coupling between the input shaft and the output shaft by displacing the power coupling mechanism in the vehicle body front/rear direction.
- With the above arrangement, in association with a movement of the vehicle body in the vehicle body front/rear direction, firstly, the engaging portion provided on the side of the vehicle body comes into engagement with the engaged portion provided on the side of the blade housing. Upon establishment of this engagement between the engaging portion and the engaged portion, connection between the vehicle body and the mower unit is realized. As a result, the vehicle body and the blade housing are fixed in position relative to each other. Therefore, the subsequent coupling operation between the input shaft and the output shaft by the power coupling mechanism using the coupling operational tool can be carried out smoothly. That is, connection between the vehicle body and the mower unit and the connection of the power transmission mechanism from the vehicle body side to the mower unit side are effected in two steps, so that the connecting/mounting operation of the mower unit to the vehicle body can be carried out in a reliable manner.
-
FIG. 1A is a schematic for explaining a first basic configuration of a mid-mount mower according to the present invention, showing a state immediately before an intermediatestructure mower unit 4 is connected to a vehicle body, -
FIG. 1B is a schematic for explaining the first basic configuration of a mid-mount mower according to the present invention, showing a state in which the mower unit is connected to the vehicle body, -
FIG. 2 is a side view showing a mid-mount mower as one of a first embodiment of the present invention, -
FIG. 3 is a perspective view showing a mower unit, -
FIG. 4 is a plan view showing a lift link mechanism and an intermediate structure, -
FIG. 5 is a perspective view showing the lift link mechanism and the intermediate structure, -
FIG. 6 is an exploded perspective view showing the lift link mechanism and the intermediate structure separately from each other, -
FIG. 7A is a section showing a flip-up mechanism for a gauge wheel, showing a state in which a rear gauge wheel is placed in contact with a ground surface, -
FIG. 7B is a section showing a flip-up mechanism for a gauge wheel, showing a state in which the rear gauge wheel is flipped up, -
FIG. 8 is a plan view showing the mower unit, -
FIG. 9 is a plan view showing the mower unit and the intermediate structure before coupling of a power coupling mechanism, -
FIG. 10 is a plan view showing the mower unit and the intermediate structure after the coupling of the power coupling mechanism, -
FIG. 11 is a vertical section showing a right-side functional portion of a first locking mechanism, -
FIG. 12 is a side view showing the first locking mechanism before coupling and showing also a blade housing in its section, -
FIG. 13 is a side view showing the first locking mechanism after the coupling and showing also the blade housing in its section, -
FIG. 14 is a side view showing the mower unit lifted up by the lift link mechanism, -
FIG. 15 is a perspective view showing the first locking mechanism and a second locking mechanism, -
FIG. 16 is a perspective view showing a state in which a portion of connection between the intermediate structure and the blade housing is locked by the first locking mechanism and the second locking mechanism, -
FIG. 17A is a schematic showing the first basic configuration of the mid-mount mower according to the present invention, showing a state immediately before the intermediatestructure mower unit 4 is connected to the vehicle body, -
FIG. 17B is a schematic showing the first basic configuration of the mid-mount mower according to the present invention, showing a state in which the intermediatestructure mower unit 4 is connected to the vehicle body, -
FIG. 18 is a side view showing a mid-mount mower as one of a second embodiment of the present invention, -
FIG. 19 is a perspective view showing a mower unit, -
FIG. 20 is a plan view showing a lift link mechanism and an intermediate structure, -
FIG. 21 is a perspective view showing the lift link mechanism and the intermediate structure, -
FIG. 22 is an exploded perspective view showing the lift link mechanism and the intermediate structure separately from each other, -
FIG. 23 is a plan view showing the mower unit singly, -
FIG. 24 is a plan view showing the mower unit and the intermediate structure before coupling of a power coupling mechanism, -
FIG. 25 is a plan view showing the mower unit and the intermediate structure after coupling of the power coupling mechanism, -
FIG. 26 is a perspective view showing the intermediate structure, -
FIG. 27 is a perspective view showing a variation of an attaching unit provided in the intermediate structure, and -
FIG. 28 is a plan view showing the intermediate structure shown inFIG. 27 . - Before a specific configuration of a first embodiment of a mid-mount mower according to the present invention is explained, a basic arrangement characterizing the present invention will be explained with reference to
FIG. 1A andFIG. 1B . A mid-mount mower (to be referred to simply as “mower” hereinafter) shown inFIG. 1A andFIG. 1B allows mounting of amower unit 4 betweenfront wheels 2 a andrear wheels 2 b under avehicle body 1 having avehicle body frame 10 as a principal constituent thereof. Downwardly of thevehicle body 1, there is provided alift link mechanism 3 consisting of a pair of left and right front links 31 and a pair of left and rightrear links 32. Via free ends of thefront links 31 and free ends of therear links 32, anintermediate structure 6 is suspended. As the free ends of thefront links 31 and the free ends of therear links 32 are connected to theintermediate structure 6 via pivotal axes, in association with a pivotal movement of thelift link mechanism 3, theintermediate structure 6 is lifted up/down relative to a ground surface. That is, thelift link mechanism 3 and theintermediate structure 6 together constitute anupper structure 9 for mounting themower unit 4 to thevehicle body 1. In this case, via thisupper structure 9, detachable connection is realized with ablade housing 40 as a principal component of themower unit 4. More particularly, on one hand, theupper structure 9 functions as an adaptor for interconnecting thevehicle body 1 and themower unit 4, with allowing the latter to be lifted up/down relative to the former. On the other hand, theintermediate structure 6 functions as an adaptor for connecting thelift link mechanism 3 to themower unit 4. For this reason, theintermediate structure 6 includes engagingportions 610, whereas theblade housing 40 of themower unit 4 includes engagedportions 620 engage able with the engagingportions 610. -
FIG. 1A shows a state immediate before establishment of connection between theintermediate structure 6 and themower unit 4.FIG. 1B shows a state after the connection establishment. The trajectory of thefront wheel 2 a at the time of connection is illustrated by a dotted line inFIG. 1A . As may be understood from theFIG. 1A andFIG. 1B illustrations, as the mower travels to ride over themower unit 4 placed still on the ground surface with lateral orientation, the engagingportions 610 of theintermediate structure 6 come into engagement with the engagedportions 620 of theblade housing 40, whereby connection is established between themower unit 4 and theintermediate structure 6. As a result, connection is realized between themower unit 4 and thevehicle body 1 of the mower. For facilitating the above-described engagement between the engagingportions 610 of theintermediate structure 6 and the engagedportions 620 of theblade housing 40 in association with a movement of thevehicle body 1 in the vehicle body front/rear direction, guide faces 630 for guiding the engagingportions 610 to engagement positions for the engagement with the engagedportions 620 are formed in one or both of theintermediate structure 6 and themower unit 4. - The mode or form of engagement between the engaging
portion 610 and the engagedportion 620 can vary in many ways. As one having a simple arrangement, a hole (slit)-pin engagement arrangement is preferably used which consists of an elongate slot extending in the vehicle body moving direction and an engaging pin engageable into this elongate slot. Alternatively, as another preferred arrangement, a recess-ball arrangement can be cited which consists of a curved recess opened in the vehicle body moving direction and a ball member coming into this curved recess. As a simple form of theguide face 630, an inclined face can be used which is inclined relative to the vehicle body moving direction and configured to provide guiding to an appropriate position in association with traveling of the vehicle body. Especially, if such inclined face is provided in one or both of the engagingportion 610 and the engagedportion 620, the arrangement can be simplified advantageously. - In general, the
mower unit 4 has no power source of its own. Therefore, power from anengine 23 mounted on the mower is received via a workingpower transmission mechanism 25 to rotate ablade 43 provided in theblade housing 40. This workingpower transmission mechanism 25 includes a vehicle body sidepower transmission mechanism 25A and a mower sidepower transmission mechanism 25B as separate units. In operation, when connection is established between a free shaft end (to be referred to also as “output shaft” hereinafter) of the vehicle body sidepower transmission mechanism 25A and a free shaft end (to be referred to also as “input shaft” hereinafter) of the mower sidepower transmission mechanism 25B, engine power is transmitted to theblade 43. The output shaft of the vehicle body sidepower transmission mechanism 25A and the input shaft of the mower sidepower transmission mechanism 25B are connected or coupled via apower coupling mechanism 7. Preferably, thispower coupling mechanism 7 is supported to theintermediate structure 6. However, themechanism 7 can also be supported to themower unit 4. Thepower coupling mechanism 7 includes acoupling body 70 having a first coupling end to be connected to the output shaft and a second coupling end to be detachably connected to the input shaft. Thecoupling body 70 is relatively displaced or preferably, relatively displaced linearly, between a coupling position realizing the coupling between the vehicle body sidepower transmission mechanism 25A and the mower sidepower transmission mechanism 25B and a decoupling position realizing decoupling therebetween. - A locking mechanism(s) is provided for mechanically retaining the connecting positions between the engaging
portions 610 and the engagedportions 620 realizing connection between thelift link mechanism 3 and themower unit 4 via theintermediate structure 6 and the coupling position of thecoupling body 70. However, illustration of this locking mechanism is omitted inFIG. 1A andFIG. 1B . Such locking mechanism can be a spring urging mechanism or retention mechanism. Preferably, an operation of the locking mechanism is effected by an operational member or tool extending to the periphery of a driver'sseat 21. Especially preferably, the connecting positions between the engagingportions 610 and the engagedportions 620 and the coupling position of thecoupling body 70 are locked by a common locking mechanism. However, separate locking mechanisms can alternatively be provided for locking them individually. - The
blade housing 40, in order to vary its ground level (i.e. its level or height from the ground surface), includes a frontgauge wheel unit 45 at a front lateral end of the vehicle body and a reargauge wheel unit 46 at a rear lateral end of the vehicle body. At least one gauge wheel included in a gauge unit consisting of the frontgauge wheel unit 45 and the reargauge wheel unit 46 is shiftable to a position for bringing at least a portion of theblade housing 40 into contact with the ground surface. As at least a portion of theblade housing 40 is placed in contact with the ground surface, it is possible to restrict inadvertent movement of themower unit 4 during a connecting operation of themower unit 4, which operation includes traveling of the mower to ride over themower unit 4. - Incidentally, in the foregoing explanation with reference to
FIG. 1A andFIG. 1B , the explanation was made that theintermediate structure 6 and thelift link mechanism 3 are provided as separate individual units. However, this explanation is applicable to an embodiment wherein theupper structure 9 comprised of theintermediate structure 6 and thelift link mechanism 3 integrated together functions as an attachment adaptor to themower unit 4. As long as the function of theintermediate structure 6 as an attachment adaptor to themower unit 4 and the function of thelift link mechanism 3 for lifting up/down themower unit 4 are realized, the configurations of theintermediate structure 6 and thelift link mechanism 3 can be freely designed. The present invention is not limited to the arrangement of theintermediate structure 6 and the lift link mechanism 30 being provided as separate individual units. - Next, with reference to drawings, one specific arrangement as a first embodiment will be explained.
FIG. 2 is a side view of a mower. This mower mounts amower unit 4 betweenfront wheels 2 a andrear wheels 2 b. However, this mower can be used also as a standard tractor, with dismounting of themower unit 4 therefrom. The mower includes a water-cooled diesel engine (to the referred to simply as “engine” hereinafter) 23 mounted on a front half portion of avehicle body frame 10 and covered by ahood 11, and a driver'sseat 21 mounted on a rear half of thevehicle body frame 10. Thefront wheels 2 a are configured as steerable wheels operated by asteering wheel 22 and are configured as drive wheels also. As the mower is four-wheel drive type, therear wheels 2 b too are configured as drive wheels. On the rear half portion of thevehicle body frame 10, a transmission case (to be referred to as “T/M case” hereinafter) 13 is mounted. - Power from the
engine 23 is transmitted via a transmission shaft (not shown) constituting apower transmission mechanism 24 to a hydrostatic stepless speed changer (to be referred to as “HST” hereinafter) 15 connected to a front portion of the T/M case 13. And, output from theHST 15 is transmitted to a gear speed changer (not shown) mounted inside the T/M case 13. Power from the gear speed changer is divided within the T/M case 13 into a front wheel driving power and a rear wheel driving power. The front wheel driving power is transmitted to thefront wheels 2 a via a front wheel power transmission mechanism (constituting the power transmission mechanism 24) extending from the T/M case 13 to thefront wheels 2 a. The rear wheel driving power is transmitted to therear wheels 2 b via a rear wheel power transmission mechanism (also constituting the power transmission mechanism 24) extending from the T/M case 13 to therear wheels 2 b. - On the other hand, the power inputted to the
HST 15 is transmitted in distribution to a first PTO (Power Take-OFF)shaft 16 mounted at the rear end of the T/M case 13 and oriented rearwards and asecond PTO shaft 17 mounted to the bottom portion of the T/M case 13 and oriented forwardly. Thefirst PTO shaft 16 and thesecond PTO shaft 17 together constitute a workingpower transmission mechanism 25 and thesecond PTO shaft 17 supplies power to themower unit 4. - At the rear portion of the T/
M case 13, there are provided such components as a pair of left and right liftarms 18 vertically pivoted by an operation of a lift cylinder (not shown) provided therein and alink mechanism 19 pivotally lifted up/down in operative association with the vertical pivotal movements of theselift arms 18. As the lift cylinder, a single-action type hydraulic cylinder is employed. Thelink mechanism 19 includes e.g. a pair of left and rightlower links 19 a for allowing mounting and dismounting of a work implement (not shown) such as a rotary cultivator, a plow, etc. - This mower has the basic arrangement of the present invention explained above with reference to
FIG. 1A andFIG. 1B . Under thevehicle body frame 10 between thefront wheels 2 a and therear wheels 2 b, themower unit 4 is mounted. Between thevehicle body frame 10 and themower unit 4, thelift link mechanism 3 and theintermediate structure 6 are disposed. Thelift link mechanism 3 supports themower unit 4 in suspension via theintermediate structure 6 such that themower unit 4 can be lifted up/down. Theintermediate structure 6 functions as an adaptor and is connected on one hand to thelift link mechanism 3 and connected on the other hand to themower unit 4. - The
lift link mechanism 3 includes a pair of left and right front links (pivot links) 31 assuming a rearwardly lowered inclined posture and interconnecting the front portion of thevehicle body frame 10 and the front portion of theintermediate structure 6, and a pair of left and right rear links (pivot links) 32 assuming a rearwardly lowered inclined posture and interconnecting a longitudinal intermediate portion of thevehicle body frame 10 and the rear portion of theintermediate structure 6. Thus, themechanism 3 constitutes a parallel link mechanism for lifting up/down themower unit 4 assuming a predetermined mowing posture, via theintermediate structure 6. The left and rightrear links 32 are coupled to left and rightlower links 19 a of alink mechanism 19 via acoupling mechanism 34. - The
coupling mechanism 34 includes, e.g. arotational shaft 341 oriented in the right/left direction and rotatably attached to thevehicle body frame 10, a pair of left and rightfirst coupling arms 342 extending to the forward side of the vehicle body from therotational shaft 341 and mounted to thisrotational shaft 341 integrally therewith, a pair of left and rightsecond coupling arms 343 extending upwardly of the vehicle body from therotational shaft 341 and mounted to thisrotational shaft 341 integrally therewith, a pair of left andright coupling arms 344 provided at the rear portion of the T/M case 13, a pair of left andright coupling rods 345 for coupling the left and rightfirst coupling arms 342 to free ends of therear links 32 corresponding thereto, a pair of left andright coupling rods 346 for coupling the left and rightsecond coupling arms 343 to thecoupling arms 344 corresponding thereto, etc. The left andright coupling arms 344 are pivotally mounted onsupport shafts 347 of thelower links 19 a corresponding thereto. At upper portions of the left andright coupling arms 344, as stoppers for restricting pivotal movement of the couplingarms 344 due to e.g. a load applied to the left and rightrear links 32, contact pieces are formed as bent portions configured to contact one side of upper edges of thelower links 19 a of thelink mechanism 19 from above. - That is, the
mower unit 4 is connected to thevehicle body frame 10 via thelift link mechanism 3 and theintermediate structure 6. Further, thelift link mechanism 3 is coupled to thelink mechanism 19 via thecoupling mechanism 34. These arrangements enable lifting up/down of themower unit 4 at the lower body portion of the tractor. - Though not shown in details in
FIG. 2 , therotational shaft 341 integrally mounts a singlethird coupling arm 348 which extends toward the rear side of the vehicle body. Thevehicle body frame 10 includes a lowerlimit setting mechanism 35 which receives thethird coupling arm 348 pivoted upwards in association with a lower pivotal movement of the left and rightrear links 32, thereby to prevent a downward pivotal movement of the left and rightrear links 32. The lowerlimit setting mechanism 35 includes such components as anoperational member 36 which can be operated pivotally about a vertical axis from the riding driving section, atubular receiving portion 37 pivotable about the vertical axis together with theoperational member 36, etc. And, the lower edge of the receivingportion 37 receiving thethird coupling arm 348 is formed like steps having different heights in the circumferential direction. - With the above-described arrangement in operation, by pivotally operating the
operational member 36 about the vertical axis from the riding driving section, it is possible to vary a receiving height position of the receivingportion 37 to receive thethird coupling arm 348 to a desired height position, whereby the lower limit position of the left and rightrear links 22 relative to the vehicle body frame 10 (to be referred to as the lower limit position of the rear links 32) can be variably set easily. - That is, the lower limit position of the left and right
rear links 32 can be variably set by this lowerlimit setting mechanism 35. As a result, the lowering limit height of themover unit 4 relative to thevehicle body frame 10 is changed. - In
FIG. 2 , thelift link mechanism 3, theintermediate structure 6 and themower unit 4 are shown. In this illustration, theintermediate structure 6 and themower unit 4 are connected to each other. InFIG. 3 , only themower unit 4 is shown.FIG. 4 ,FIG. 5 andFIG. 6 show theintermediate structure 6 connected to thelift link mechanism 3.FIG. 6 shows a state wherein thefront links 31, therear links 32 and theintermediate structure 6 are separated from each other. As may be apparent from theFIG. 3 illustration, themower unit 4 includes a vertically orientedrotational shaft 43 a for rotating three blades clockwise which are juxtaposed along the vehicle body traverse direction in a plan view, though not seen inFIG. 3 illustration, and theblade housing 40 covering these blades from above. Theblade housing 40 includes atop plate 41 and aside plate 42 extending downwards from the circumferential edge of thetop plate 41. Thetop plate 41 of theblade housing 40 mounts a blade drivingpower distribution mechanism 44. Also, a transmission cover for covering from above abelt transmission mechanism 44 c of thepower distribution mechanism 44 is detachably mounted, but its illustration is omitted inFIG. 3 . Theblade housing 40, at its front end region, forms an upwardly extending bulging portion extending along the right/left direction, thereby to create a transport passage for mowed grass therein. Adischarge cover 40 a is attached to the right end of theblade housing 40 forming a discharge outlet of this transport passage. - That is, this
mower unit 4 is configured as a side-discharge type in which grass clippings cut by the three blades are transported through the transport passage formed inside theblade housing 40 by transporting air current generated in association with rotation of each blade and discharged through the discharge outlet at the right end of theunit 4 to the outside. - As shown in
FIG. 3 , at the left and right opposed ends of the front portion and the rear portion of theblade housing 40, there are provided frontgauge wheel units 45 each being height-adjustable and reargauge wheel units 46 also each being height-adjustable. Incidentally, inFIG. 7 , the reargauge wheel unit 46 alone is shown in enlargement. Each frontgauge wheel unit 45 includes asupport bracket 45 b having avertical boss portion 45 c and afront gauge wheel 45 a mounted on an axle fixed to a slidingsupport shaft 45 d slidably inserted into thevertical boss portion 45 c. The slidingsupport shaft 45 d is fixed at a selected position by pin-fixing. The reargauge wheel unit 46, as shown inFIG. 7 in details, includes asupport bracket 46 b having avertical boss portion 46 c flipped up by a flip-upmechanism 47, and arear gauge wheel 46 a mounted on an axle fixed to a slidingsupport shaft 46 d slidably inserted into thevertical boss portion 46 c. The slidingsupport shaft 46 d too is fixed at a selected position by pin-fixing. The flip-upmechanism 47, in this embodiment, is configured to retain a vertical posture of the slidingsupport shaft 45 d by retaining, by a spring-urged pivot arm, thevertical boss portion 46 c supported to thesupport bracket 46 b to be pivotable about a horizontal axis (seeFIG. 7A ) and also to render the slidingsupport shaft 45 d to an inclined posture by releasing the retention of the pivot arm (seeFIG. 7B ). Namely, this flip-upmechanism 47 has a function of flipping up therear gauge wheel 46 a, by releasing the spring urging. When therear gauge wheel 46 a is flipped up, the lower end of theside plate 42 of theblade housing 40 comes into contact with the ground surface. With this, a large frictional force is applied between theblade housing 40 and the ground surface, so that even in the event of application of an external force thereto, movement of theblade housing 40 is restricted. - As shown clearly in
FIG. 8 , thepower distribution mechanism 44 includes an input shaft (a constituent of the mower sidepower transmission mechanism 25B) extending rearwards from ahousing 44 a disposed at the center of theblade housing 40, and thebelt transmission mechanism 44 c for transmitting the power received by theinput shaft 44 b in distribution to threerotational shafts 43 a to which theblades 43 are fixed respectively. - Next, with reference to
FIG. 4 ,FIG. 5 ,FIG. 6 andFIG. 9 andFIG. 10 , an embodiment of theintermediate structure 6 will be explained. Thisintermediate structure 6 has a framework consisting of afirst member 61 and asecond member 62 which extend in the vehicle body front/rear direction with forming a space therebetween, afront connecting member 63 interconnecting front portions of thefirst member 61 and thesecond member 62, and arear connecting member 64 interconnecting rear portions of thefirst member 61 and thesecond member 62. The front connectingmember 63 is a bar-like member having a convex portion at the center thereof, and at this convex portion, a hook-like free end of thefront link 31 of thelift link mechanism 3 is pivotally retained. To the rear portions of thefirst member 61 and thesecond member 62, the free end of therear links 32 of thelift link mechanism 3 are pivotally pin-connected via link pins 39. - To interconnect the
intermediate structure member 6 and theblade housing 40, theintermediate structure 6 includes engagingportions 610, whereas thetop plate 41 of theblade housing 40 includes engagedportions 620 engageable with the engagingportions 610. In the instant embodiment, each engagingportion 610 includes a vehicle body side firstfront guide 611 provided as a bent portion formed in the region of thefirst member 61 connected to the connectingmember 63, a vehicle body side secondfront guide 612 provided as a bent portion formed in the region of thesecond member 62 connected to the connectingmember 63, a vehicle body side firstrear guide 613 provided as an outwardly projecting bracket-like member disposed at the rear end of thefirst member 61, and a vehicle body side secondrear guide 614 provided as an outwardly projecting bracket-like member disposed at the rear end of thefirst member 61. - Each engaged
portion 620 includes a mower sidefirst guide 621 and a mower side secondfront guide 622 which are disposed erect at the front region of thetop plate 41 in distribution on the left and right sides, and a mower side firstrear guide 623 and a mower side secondrear guide 624 which are disposed erect at the rear region of thetop plate 41 in distribution on the left and right sides. The mower side firstfront guide 621 and the vehicle body side firstfront guide 611, the mower side secondfront guide 622 and the vehicle body side secondfront guide 612, the mower side firstrear guide 623 and the vehicle body side firstrear guide 613, the mower side secondrear guide 624 and the vehicle body side secondrear guide 614, are disposed respectively at mutually engaging positions, under the interconnected state of theintermediate structure 6 and theblade housing 40. - In this embodiment, the vehicle body side first
front guide 611 and the vehicle body side secondfront guide 612 respectively include anengaging pin 69A extending horizontally in an obliquely forward direction. Whereas, the vehicle body side firstrear guide 613 and the vehicle body side secondrear guide 614 respectively include anelongate slot 69C extending horizontally in an oblique direction and opened to the front side. Further, the mower side firstfront guide 621 and the mower side secondfront guide 622 respectively include anelongate slot 69B extending horizontally in an oblique direction and opened to the rear side. - Further, in a rear region of the
top plate 41, arotational operation shaft 80 for alocking mechanism 8 to be described in details later extends in the vehicle body transverse direction (transverse direction). Thisrotational operation shaft 80 functions as an engaging pin engageable with theelongate slots 69C of the vehicle body side firstrear guide 613 and the vehicle body side secondrear guide 614. - The vehicle body side first
front guide 611, the vehicle body side secondfront guide 612, the vehicle body side firstrear guide 613, the vehicle body side secondrear guide 614, and the mower side firstfront guide 621, the mower side secondfront guide 622, the mower side firstrear guide 623, the mower side secondrear guide 624, respectively include an inclined face which extends closer to a vehicle body longitudinal centerline as it extends forwardly. And, the respective corresponding inclined faces are formed so as to come into contact with each other substantially, under the interconnected state of theintermediate structure 6 and theblade housing 40. Namely, these inclined faces function as “guide faces” for guiding theintermediate structure 6 to the position for connection with themower housing 40 as the mower travels forwardly relative to theblade housing 40 placed on the ground surface. That is, the engagingportions 610 of theintermediate structure 6 and the engagedportions 620 of theblade housing 40 respectively include a guide face as an inclined face, and these guide faces come into contact with each other in association with a movement in the vehicle body front/rear direction. - The
second PTO shaft 17 transmits power to theinput shaft 44 b (seeFIG. 6 ) of thepower distribution mechanism 44 of themower unit 4, and the workingpower transmission mechanism 25 disposed therebetween is divided into the vehicle body sidepower transmission mechanism 25A and the mower sidepower transmission mechanism 25B. These mechanisms can be connected to or disconnected from each other by thepower coupling mechanism 7 provided in theintermediate structure 6. In the instant embodiment, the mower sidepower transmission mechanism 25B includes a first universal joint 25 b and theinput shaft 44 b. The vehicle body sidepower transmission mechanism 25A includes arelay shaft 25 a, the first universal joint 25 b and a second universal joint 25 c. The first universal joint 25 b interconnects thesecond PTO shaft 17 and therelay shaft 25 a. The second universal joint 25 c interconnects therelay shaft 25 a functioning as an output shaft of the vehicle body sidepower transmission mechanism 25A and theinput shaft 44 b functioning as an input shaft of the mower sidepower transmission mechanism 25B. This second universal joint 25 c includes a spline-type connecting portion enabling connection to and disconnection from theinput shaft 44 b. The mechanism for effecting these connection and disconnection is thepower coupling mechanism 7. The disconnecting state of thepower coupling mechanism 7 is shown inFIG. 9 and its connecting state is shown inFIG. 10 . - As may be understood from
FIG. 9 andFIG. 10 , thepower coupling mechanism 7 includes acoupling body 70 which is provided as the second universal joint 25 c in this embodiment, acoupling holding portion 73 configured to hold thecoupling body 70 by surrounding it and holding it via an inner circumferential face thereof, and an attachingunit 75 for attaching thecoupling holding portion 73 to the intermediate structure with allowing displacement of thecoupling holding portion 73 in the vehicle body front/rear direction. Thecoupling body 70 includes a first connectingend 71 to be connected to therelay shaft 25 a and a second connectingend 72 to be connected to theinput shaft 44 b. The second connectingend 72 has an inner circumferential face formed with a spline engageable with the spline formed on theinput shaft 44 b. Thecoupling holing portion 73 is a boss member having projections at opposed ends thereof. And, thecoupling body 70 is fixed within a boss hole of this boss member. As thecoupling holding portion 73 is moved toward theinput shaft 44 b of thepower distribution mechanism 44, theinput shaft 44 b and the second connectingend 72 are spline-engaged with each other. The attachingunit 75 is provided for realizing such movement of thecoupling holding portion 73. To this end, the attachingunit 75 is configured as a slider mechanism for moving thecoupling holding portion 73. As a force (e.g. an operational force by a driver) is applied from the outside to this slider mechanism, thecoupling holding portion 73 is moved, thus realizing the connection of thepower coupling mechanism 7. In this embodiment, in order to cause a translation movement of thecoupling holding portion 73, there are provided afirst leg portion 75 a and asecond leg portion 75 b as a pair of slider rods, and guide holes as slide guides for the respective slider rods. Thefirst leg portion 75 a is a bar-like member fixed to the left end of thecoupling holding portion 73 and extending rearwards therefrom. Thesecond leg portion 75 b is a bar-like member fixed to the right end of thecoupling holding portion 73 and extending rearwards therefrom. The guide holes are through holes formed in afirst bracket 65 a and asecond bracket 65 b provided in thefirst member 61 and thesecond member 62, respectively, as will be described later herein. Thefirst leg portion 75 a and thesecond leg portion 75 b are inserted into these through holes, thus being slidably supported to thefirst bracket 65 a and thesecond bracket 65 b. Meanwhile, in the instant embodiment, the attachingunit 75 is supported to thefirst member 61 and thesecond member 62, that is, to theintermediate structure 6. However, instead of this, the attachingunit 75 can be supported to thevehicle body 1, e.g. to thevehicle body frame 10. - The
intermediate structure 6 includes thefirst bracket 65 a having a U-shape in its plan view and having its end connected to thefirst member 61 and extending toward thesecond member 62, and thesecond bracket 65 b having a U-shape in its plan view and having its end connected to thesecond member 62 and extending toward thefirst member 61. Between the leading end of thefirst bracket 65 a and the leading end of thesecond bracket 65 b, there is formed a gap through which therelay shaft 25 a can pass. Further, thefirst bracket 65 a defines, in its leading end region, a hole in which thefirst leg portion 75 a is inserted and thesecond bracket 65 b defines, in its leading end region, a hole in which thesecond leg portion 75 b is inserted. With these, thefirst leg portion 75 a and thesecond leg portion 75 b are supported to the attachingunit 75 to be movable in the vehicle body front/rear direction. When thecoupling holding portion 73 is moved together with the attachingunit 75 to a predetermined connecting position toward theinput shaft 44 b of thepower distribution mechanism 44 under the interconnected state of theintermediate structure 6 and theblade housing 40, spline connection is established between the second connectingend 72 of the coupling body (the second universal joint 25 c) and theinput shaft 44 b. - Incidentally, as shown in
FIG. 9 andFIG. 10 , between thefirst leg portion 75 a of thepower distribution mechanism 44 and thefirst bracket 65 a and also between thesecond leg portion 75 b of themechanism 44 and thesecond bracket 65 b, springs 76 are disposed for providing an urging force to release connection between thecoupling body 70 held to thecoupling holding portion 73 and theinput shaft 44 b of thepower distribution mechanism 44. Accordingly, when thelocking mechanism 8 is pivoted in the direction for releasing lock, thecoupling body 70 is automatically withdrawn from theinput shaft 44 b. InFIG. 9 , there is shown an expanded state of thespring 76, that is, a state prior to establishment of spline-engagement between theinput shaft 44 b and the second connectingportion 72. InFIG. 10 , there is shown a compressed state of thespring 76, that is, a state after establishment of the spline-engagement between theinput shaft 44 b and the second connectingportion 72. - Next, with reference to
FIGS. 8 through 16 , thelocking mechanism 8 provided in theblade housing 40 in this embodiment will be explained in details. As shown in the plan view ofFIG. 8 , thelocking mechanism 8 includes afirst locking mechanism 8A for locking thecoupling holding portion 73 at the connecting position and asecond locking mechanism 8B for locking the engagingportions 610 and the engagedportions 620 at the mutually engaged positions. Thefirst locking mechanism 8A and thesecond locking mechanism 8B include a commonrotational operation shaft 80. And, thisrotational operation shaft 80 extends in the vehicle body traverse direction in the rear end region of thetop plate 41 of theblade housing 40 and is rotatably supported by a plurality of bearing stands. Therotational operation shaft 80 includes twofirst acting portions 81 for thefirst locking mechanism 8A and twosecond acting portions 82 for thesecond locking mechanism 8B. Thefirst acting portions 81 are provided as arms configured to come into contact with the contacting portions provided at the rear ends of thefirst leg portion 75 a and thesecond leg portion 75 b of thepower coupling mechanism 7 in association with rotation of therotational operation shaft 80 to press thecoupling holding portion 73 to the connecting position and holding this connecting position. Thesecond acting portions 82 are provided as hook-like arms configured to come into contact with a pin-like projection 61 a provided in thefirst member 61 and a pin-like projection 62 a provided in thesecond member 62 and to hold these projections therein, thus retaining the engagingportions 610 and the engagedportions 620 at the engaging positions thereof, whereby the interconnection between theintermediate structure 6 and theblade housing 40 is retained. At one end of therotational operation shaft 80, there is fixed a rod-likeoperational arm 83 extending to the periphery of the driver'sseat 21. By an operation of theoperational arm 83 by a driver seated at the driver'sseat 21, locking and lock-releasing of thelocking mechanism 8 are possible. - With the mower according to the present invention, when the
mower unit 4 is to be mounted to thevehicle body 1, the mower is caused to travel forwardly to ride over themower unit 4 placed laterally on the ground surface. To this end, theblade housing 40 includes a ride-overmechanism 5. This ride-overmechanism 5, as shown inFIG. 3 andFIG. 11 , is provided for each one of the left and rightfront wheels 2 a. And, the distance between themechanisms 5 corresponds to the front-wheel tread width. Each ride-overmechanism 5 includes abridge portion 50 extending along the front/rear direction upwardly of thebelt transmission mechanism 44 c mounted to thetop plate 41 of theblade housing 40, a frontauxiliary plate 51 extending with an inclination from the front end of thebridge portion 50 toward the ground surface, and a rearauxiliary plate 52 extending with an inclination from the rear end of thebridge portion 50 toward the ground surface. Thebridge portion 50 consists of a pair of arch-shaped rods having a flat intermediate portion, and a stepping plate disposed on the top faces of the intermediate portions of the pair of rods. Further, to opposed sides of thebridge portion 50,side plates 53 are attached. The frontauxiliary plate 51 and the rearauxiliary plate 52 are configured as slide type, so that these plates are retracted within thebridge portion 50 when out of use. This slide-type storage is realized by aguide pin 51 a provided at the rear end of the frontauxiliary plate 51 and aguide pin 52 a and guide slits 53 a provided at the front end of the rearauxiliary plate 52. The guide slits 53 a are formed in therespective side plates 53 substantially horizontally in the front/rear direction so as to respectively guide theguide pin 51 a and theguide pin 52 a inserted therein during the movement. But, these guide slits 53 a are formed vertical at terminal ends thereof so as to retain the inclined postures of the frontauxiliary plate 51 and the rearauxiliary plate 52 in a reliable manner, when the pins are withdrawn therefrom. - Firstly, for mounting the
mower unit 4 to the lower body portion of the tractor, theintermediate structure 6 is lowered in advance to its lower limit position by an operation of thelift link mechanism 3. In succession, thevehicle body 1 is caused to travel forwardly so that thefront wheels 2 a move above theblade housing 40 to ride over this housing with utilizing the ride-overmechanism 5 from the rear side of themower unit 4. When thefront wheels 2 a have passed over theblade housing 40, the engaging portions 610 (the four guides 611-614 provided on the front, rear, left and right sides) provided in theintermediate structure 6 come into engagement with the engaged portions 620 (the four guides 621-624 provided on the front, rear, left and right sides) provided in theblade housing 40. More particularly, the engagingpins 69A provided in the vehicle body side firstfront guide 611 and the vehicle body side secondfront guide 612 are guided by the respective guide faces 630 and enter theelongate slots 69B provided in the mower side firstrear guide 613 and the mower side secondrear guide 614. In the course of this, the vehicle body side firstrear guide 613 and the vehicle body side secondrear guide 614 come into face contact with the mower side firstrear guide 623 and the mower side secondrear guide 624, respectively and move into the regions restricted by these mower side firstrear guide 623 and mower side secondrear guide 624. At the same time, into the slots 69 provided in the vehicle body side firstrear guide 613 and the vehicle body side secondrear guide 614, therotational operation shaft 80 of thelock mechanism 8 as an engaging pin enters. After thefront wheels 2 a have ridden past over theblade housing 40, thevehicle body 1 is stopped. - At this point, on the axis of the
input shaft 44 b extending rearwards in the vehicle body front/rear direction of thepower distribution mechanism 44 of themower unit 4, the axis of thecoupling body 70 of thepower coupling mechanism 7 provided in theintermediate structure 6 is positioned. Thus, theinput shaft 44 b and thecoupling body 40 are aligned on the same axis in the vehicle body front/rear direction. - After the
vehicle body 1 is stopped, the driver operates theoperational arm 83 of thelocking mechanism 8 to rotate the rotational operation shaft 80 (seeFIG. 13 andFIG. 14 ). In response to this, the arms constituting thefirst acting portions 81 of thelocking mechanism 8 press the rear ends (contacting portions) of thefirst leg portion 75 a and thesecond leg portion 75 b of thepower coupling mechanism 7 provided in theintermediate structure 6, thereby to move thecoupling holding portion 73 together with thecoupling body 70, thus establishing interconnection between theinput shaft 44 b and the coupling body 70 (seeFIG. 16 ). Simultaneously, the two hook-like arms constituting thesecond acting portions 82 rotate and surround the pin-like projection 61 a provided in thefirst member 61 and the pin-like projection 62 a provided in thesecond member 62. With this, the final engaged state between the engagingportions 610 and the engagedportions 620 is established. That is, according to the instant embodiment, the vehicle body side firstfront guide 611 and the mower side firstfront guide 621, the vehicle body side secondfront guide 612 and the mower side secondfront guide 622, the vehicle body side firstrear guide 613 and the mower side firstrear guide 623, the vehicle body side secondrear guide 614 and the mower side secondrear guide 624 respectively are rendered to the respective engaged states. These engaged states will be maintained as long as the two hook-like arms as thesecond acting portions 82 keep pressing theprojection 61 a and theprojection 62 a. This engagement retained sate is illustrated in enlargement inFIG. 15 . Further, in order to maintain this engaged state, alocking device 84 for locking therotational operation shaft 80 at its engaging rotational position is provided at the interconnecting position between theoperational arm 83 and therotational operation shaft 80. The construction of thislocking device 84 per se is well-known, thus detailed illustration thereof is omitted herein. Referring only briefly thereto, in this embodiment, therotational operation shaft 80 is locked as a lock pin enters a lock hole at the engaging rotational position. And, as the lock pin moves out of the lock hole, locking of therotational operation shaft 80 is released. Needless to say, any other locking arrangement can be employed also. - For dismounting the
mower unit 4 from thevehicle body 1, thelift link mechanism 3 is lowered so as to place themower unit 4 onto the ground surface. Then, the driver operates theoperational arm 83 of thelocking mechanism 8 to rotate therotational operation shaft 80 of thelocking mechanism 8 to a locking release position. In response to this, the connection between theinput shaft 44 b and thecoupling body 70 is released. In succession, thevehicle body 1 is caused to travel in reverse so that thefront wheels 2 a move above theblade housing 40 to ride over this housing with utilizing the ride-overmechanism 5 from the front side of themower unit 4. With this reverse traveling, the engaging portions 610 (the four guides 611-614 provided on the front, rear, left and right sides) provided in theintermediate structure 6 move out of the engaged portions 620 (the four guides 621-624 provided on the front, rear, left and right sides) provided in theblade housing 40. After thefront wheels 2 a have ridden past over theblade housing 40, the mower unit is released, so that this unit can be carried out freely. - Before a specific configuration of a second embodiment of a mid-mount mower according to the present invention is explained, a basic arrangement characterizing the present invention will be explained with reference to
FIG. 17A andFIG. 17B . The arrangement shown inFIGS. 17A and 17B differs from that shown inFIGS. 1A and 1B in that anoperational tool 830 is provided in the arrangement shown inFIGS. 1A and 1B . Here, the blade power transmission mechanism (working power transmission mechanism) 25 connectable to and disconnectable from a mower unit side shaft member and a vehicle body side shaft member in order to transmit rotational power of theengine 23 mounted on the mower to theblades 43 mounted to theblade housing 40 is rendered into a connected state for allowing the power transmission by using theoperational tool 830. - The
coupling body 70 acting as an output shaft of the vehicle body sidepower transmission mechanism 25A is relatively displaced, preferably linearly moved, between a connecting position realizing interconnection between the machine body sidepower transmission mechanism 25A and the mower sidepower transmission mechanism 25B and a releasing position realizing disconnection therebetween. This relative displacement is effected manually with using theoperational tool 830. Its operational force can use also a power of an electric motor, an electric cylinder, a hydraulic cylinder, etc. instead of the manual force. - Next, with reference to some drawings, one specific configuration as the second embodiment will be explained.
FIG. 18 is a side view of a mower. As many parts thereof are identical to those of the first embodiment explained above with reference toFIGS. 1-16 , the following explanation will focus on difference from the first embodiment.FIG. 20 ,FIG. 21 andFIG. 22 show alift link mechanism 3 and anintermediate structure 6 in the second embodiment. The basic configurations thereof are identical to those of the first embodiment. - As shown in
FIG. 23 , at a rear region of atop plate 41 of ablade housing 40, alocking fixing rod 800 constituting asecond locking mechanism 8B as one example of thelocking mechanism 8 to be described in details later extends in the vehicle body traverse direction (traverse direction). A mower side secondrear guide 624 and a vehicle body side secondrear guide 614 form cutouts for avoiding interference with thislocking fixing rod 800. - As shown in
FIG. 24 andFIG. 25 ,FIG. 26 andFIG. 27 , apower coupling mechanism 7 includes acoupling body 70 as a second universal joint 25 c, acoupling holding portion 730 surrounding thecoupling body 70 and holding thiscoupling body 70 via its inner circumferential face, and an attachingunit 75 for attaching thiscoupling holding portion 730 to the intermediate structure, with allowing displacement of theportion 730 in the vehicle body front/rear direction. Thecoupling body 70 includes a first connectingend 71 to be connected to therelay shaft 25 a and a second connectingend 72 to be connected to theinput shaft 44 b. The second connectingend 72 has an inner circumferential face formed with a spline engageable with the spline formed on theinput shaft 44 b. Thecoupling holding portion 730 is a plate-like boss member having extension pieces at opposed ends thereof. And, thecoupling body 70 is fixed within a boss hole of this plate-like boss member. As thecoupling holding portion 730 is moved toward theinput shaft 44 b of thepower distribution mechanism 44, theinput shaft 44 b and the second connectingend 72 are spline-engaged with each other. The attachingunit 75 is provided for realizing such movement of thecoupling holding portion 730. - To the above end, the attaching
unit 75 is configured as a slider mechanism for moving thecoupling holding portion 730. As a force (e.g. an operational force by a driver) is applied from the outside to this slider mechanism, thecoupling holding portion 730 is moved, thus realizing the connection of thepower coupling mechanism 7. In this embodiment, in order to cause a translation movement of thecoupling holding portion 730, there are provided afirst leg portion 751 and asecond leg portion 752 as a pair of slider rods, and guide holes as slide guides for the respective slider rods. Thefirst leg portion 751 is configured as a bar-like member fixed to the left side extension of thecoupling holding portion 730 and extending rearwards therefrom. Thesecond leg portion 752 is configured as a bar-like member fixed to the right side extension piece of thecoupling holding portion 730 and extending rearwards therefrom. The rear ends of thefirst leg portion 751 and thesecond leg portion 752 are interconnected via a connecting plate 753. The attachingunit 75 includes, as bases, afirst base plate 651 fixed to thefirst member 61 and asecond base plate 652 fixed to thesecond member 62. To the respect inner edges of thefirst base plate 651 and thesecond base plate 652, afirst bracket 653 and asecond bracket 654 are fixed, respectively. Between thefirst bracket 653 and thesecond bracket 654, there is formed a gap allowing passage of therelay shaft 25 a therethrough. Thefirst bracket 653 and thesecond bracket 654 respectively is configured as a C-shaped bent plate in its plan view and through holes are formed at its opposed end regions. These through holes function as guide holes for thefirst leg portion 751 and thesecond leg portion 752. More particularly, thefirst leg portion 751 and thesecond leg portion 752 are inserted in the through holes formed coaxially at the opposed ends of thefirst bracket 653 and thesecond bracket 654 and slidably supported to thefirst bracket 653 and thesecond bracket 654. An arch-shapedcover 656 is provided for partially covering, from above, the second universal joint 25 c provided on therelay shaft 25 a connected to theinput shaft 44 b of the mower sidepower transmission mechanism 25B. This arch-like cover 656 is shown as being removed in the illustrations ofFIG. 26 andFIG. 27 , but it is shown as being attached in the illustrations ofFIG. 24 andFIG. 25 . - The
operational lever 830 selectively providing the connected state and the disconnected state of thepower transmission mechanism 7 is configured as anoperational lever 830 pivotable about a pivotal vertical axis Pa as shown inFIG. 26 , and aslit 831 is formed at one end thereof. And, in thisslit 831, apin 832 fixed to thesecond leg portion 752 is inserted. Under the interconnected state of theintermediate structure 6 and theblade housing 40, as theoperational lever 830 is pivotally operated, thecoupling body 70 is moved in the front/rear direction. With this, connection (splined connection) of thecoupling body 70 acting as the output shaft of the vehicle body sidepower transmission mechanism 25A and theinput shaft 44 b or disconnection thereof from theinput shaft 44 b are realized. - Between the
first leg portion 751 and thefirst bracket 653 and also between thesecond leg portion 752 and thesecond bracket 654, springs 76 are provided for urging in the direction of releasing the connection of thecoupling body 70 held to thecoupling holding portion 73 and theinput shaft 44 b of thepower distribution mechanism 44. Further, as shown inFIG. 21 andFIG. 22 , to the outer face of thefirst member 61 of theintermediate structure 6, there is fixed astopper plate 833 configured to hold theoperational lever 830 at its pivotal position for interconnecting thecoupling body 70 and theinput shaft 44 b. Thisstopper plate 833 forms acutout portion 834 which has a substantially same width as theoperational lever 830 and which is opened downwards. Thiscutout portion 834 is configured to maintain theoperational lever 830 at the pivotal position for interconnecting thecoupling body 70 and theinput shaft 44 b. Theoperational lever 830 and thecutout portion 834 constitute thefirst locking mechanism 8A as one of thelocking mechanism 8. - Next, there will be explained the
locking mechanism 8 for locking mounting of themower unit 4 to thevehicle body 1. Thislocking mechanism 8 includes thefirst locking mechanism 8A for locking thecoupling holding portion 73 at the connecting position and thesecond locking mechanism 8B for locking the engagingportions 610 and the engagedportions 620 at the respective engaged positions. Thefirst locking mechanism 8A and thesecond locking mechanism 8B are operatively coupled to each other vialock coupling link 840, as may be understood fromFIG. 24 ,FIG. 25 andFIG. 26 . - As shown in
FIG. 25 andFIG. 26 , between the rear end portion of thefirst member 61 and the rear end portion of thesecond member 62 of theintermediate structure 6 and on the front side of therear connecting member 64 and parallel with thisrear connecting member 64, arotational operation shaft 880 is rotatably mounted. On thisrotational operation shaft 880, a pair of left and right lockingengagement pieces 820 are fixed with a spacing therebetween. Further, on thisrotational operation shaft 880, a connectingarm 841 is fixed. The connectingarm 841 is link-connected to the connectingplate 655 via thelock coupling link 840. With this arrangement, sliding displacements of thefirst leg portion 751 and thesecond leg portion 752 are transmitted to the connectingarm 841, whereby therotational operation shaft 880 is rotated. The lockingengagement pieces 820 are configured as hook-like arms, so that in association with rotation of therotational operation shaft 880, thesepieces 820 engage with thelock fixing rod 800 fixed to theblade housing 40. - A pivotal displacement of the
operational lever 80 establishing interconnection between thecoupling body 70 functioning as the output shaft of the vehicle body sidepower transmission mechanism 25A and theinput shaft 44 b is converted into a rotational displacement for engaging the lockingengagement pieces 820 to thelock fixing rod 800. Namely, as described above, theoperational lever 830 and a slit 844 formed in thestopper plate 833 together constitute thefirst locking mechanism 8A as one component of thelocking mechanism 8, and the lockingengagement pieces 820, thelock fixing rod 800 and thelock coupling link 840 together constitute thesecond locking mechanism 8B. - When the
mower unit 4 is to be mounted to thevehicle body 1, the mower is caused to travel forwardly to ride over themower unit 4 placed laterally on the ground surface. To this end, theblade housing 40 includes a ride-overmechanism 5. This ride-overmechanism 5, as shown inFIG. 19 andFIG. 24 , is provided for each one of the left and rightfront wheels 2 a. And, the distance between themechanisms 5 corresponds to the front-wheel tread width. Each ride-overmechanism 5 includes abridge portion 500 extending along the front/rear direction upwardly of thebelt transmission mechanism 44 c mounted to thetop plate 41 of theblade housing 40, a frontauxiliary plate 510 extending with an inclination from the front end of thebridge portion 500 toward the ground surface, and a rearauxiliary plate 520 extending with an inclination from the rear end of thebridge portion 500 toward the ground surface. Thebridge portion 500 consists of a pair of arch-shaped frames having a flat intermediate portion and its cross section is formed like an upwardly opened channel. When not in use, the frontauxiliary plate 510 and the rearauxiliary plate 520 are retracted and stored within thebridge portion 500. The frontauxiliary plate 510 and the secondauxiliary plate 520 respectively include, at one end thereof, pins 511 and 521 projecting in the traverse direction. And, at front end and rear end of thebridge portion 500, there are formedcutouts 501 for receiving thesepins front wheels 2 a, the frontauxiliary plate 510 and the rearauxiliary plate 520 are inclined to orient theirpins pins cutouts 501. At the time of storage, the orientations of the frontauxiliary plate 510 and the rearauxiliary plate 520 are reversed and theseplates bridge portion 500 and also thepins cutouts 501. - Firstly, for mounting the
mower unit 4 to the lower body portion of the tractor, theintermediate structure 6 is lowered in advance to its lower limit position by an operation of thelift link mechanism 3. In succession, thevehicle body 1 is caused to travel forwardly so that thefront wheels 2 a move above theblade housing 40 to ride over this housing with utilizing the ride-overmechanism 5 from the rear side of themower unit 4. When thefront wheels 2 a have passed over theblade housing 40, the engaging portions 610 (the four guides 611-614 provided on the front, rear, left and right sides) provided in theintermediate structure 6 come into engagement with the engaged portions 620 (the four guides 621-624 provided on the front, rear, left and right sides) provided in theblade housing 40. More particularly, the engagingpins 69A provided in the vehicle body side firstfront guide 611 and the vehicle body side secondfront guide 612 are guided by the respective guide faces 630 and enter theelongate slots 69B provided in the mower side firstfront guide 621 and the mower side secondfront guide 622. In the course of this, the vehicle body side firstrear guide 613 and the vehicle body side secondrear guide 614 come into face contact with the mower side firstrear guide 623 and the mower side secondrear guide 624, respectively and move into the regions restricted by these mower side firstrear guide 623 and mower side secondrear guide 624. - When the
front wheels 2 a have moved above theblade housing 40 to ride over this housing with utilizing the ride-overmechanism 5 from the rear side of themower unit 4, thevehicle body 1 is stopped. At this point, on the axis of theinput shaft 44 b extending rearwards in the vehicle body front/rear direction of thepower distribution mechanism 44 of themower unit 4, the axis of thecoupling body 70 of thepower coupling mechanism 7 provided in theintermediate structure 6 is positioned. Thus, theinput shaft 44 b and thecoupling body 40 are aligned on the same axis in the vehicle body front/rear direction. - After stopping of the
vehicle body 1, the driver pivotally operates theoperational lever 830 to engage thisoperational lever 830 into theslit 831. This pivotal displacement, on one hand, realizes interconnection between thecoupling body 70 functioning as an output shaft of the vehicle body sidepower transmission mechanism 25A and theinput shaft 44 b, and this state is maintained by the function of thefirst locking mechanism 8A and the above displacement realizes, on the other hand, engagement of the lockingengagement piece 820 to thelocking fixing rod 800, and this state is maintained by the function of thesecond locking mechanism 8B. - For dismounting the
mower unit 4 from thevehicle body 1, thelift link mechanism 3 is lowered so as to place themower unit 4 onto the ground surface. Then, the driver operates theoperational lever 830 to remove it from theslit 831. Theoperational lever 830 disengaged from theslit 831 is pivoted to its home position by the resilience of thespring 76. This pivotal displacement realizes, on one hand, disconnection between thecoupling body 70 functioning as an output shaft of the vehicle body sidepower transmission mechanism 25A and theinput shaft 44 b, and realizes, on the other hand, disengagement of the lockingengagement piece 820 from thelocking fixing rod 800. As a result, the interconnection between theblade housing 40 and theintermediate structure 6 is released. Further, thevehicle body 1 is caused to travel in reverse so that thefront wheels 2 a move above theblade housing 40 to ride over this housing with utilizing the ride-overmechanism 5 from the front side of themower unit 4. With this reverse traveling, the engagingportions 610 provided in theintermediate structure 6 move out of the engagedportions 620 provided in theblade housing 40. After thefront wheels 2 a have ridden past over theblade housing 40, themower unit 4 is released, so that this unit can be carried out freely. - [1] The engagement arrangement for interconnecting the
intermediate structure 6 and theblade housing 40, consisting of the engagingportions 610 included in theintermediate structure 6 and the engagedportions 620 included in theblade housing 40 can be of any other engagement arrangement form than the hole-pin engagement described above, e.g. pawl engagement arrangement, as long as such other arrangement too realizes engagement in association with approaching in the vehicle body front/rear direction with forward traveling of thevehicle body 1 and disengagement in association with departing in the vehicle body front/rear direction with reverse traveling of thevehicle body 1. Further alternatively, these different engagement arrangements can be used in combination. Also, in the foregoing embodiment, the number of the engaging connecting points created by the engagingportions 610 and the engagedportions 620 was four. However, it can be any number of two or more. - [2] In the foregoing embodiment, mutually contacting plate faces of the vehicle body side first
front guide 611 and the mower side firstfront guide 621 were used as the guide faces 630; and mutually contacting plate faces of the vehicle body side secondfront guide 612 and the mower side secondfront guide 622 were used as the guide faces 630. Instead, separate members can be provided for creating these guide faces 630. Further, in the foregoing, therotational operation shaft 80 of thelocking mechanism 8 was employed as an engaging pin to come into engagement with theelongate slots 69C provided in the vehicle body side firstrear guide 613 and the vehicle body side secondrear guide 614. Instead, a separate engaging pin dedicated to this end can be provided in theblade housing 40. - [3] The
mower unit 4 can be configured as a rear-discharge type in which grass clippings are discharged rearwards from a discharge opening formed at the rear end of theblade housing 40. Further alternatively, themower unit 4 can be mulching type in which grass clippings cut by the blade are minced while being circulated inside theblade housing 40 and then dropped through an opening formed in the bottom of theblade housing 40 onto the ground surface. Furthermore, the number of blades to be provided in themid-mount mower unit 4 and the transmission arrangement for the blade can vary in many ways. - [4]
FIG. 27 andFIG. 28 show a further embodiment of an attachingunit 75 configured to move thecoupling body 40 back and forth. In this further embodiment, instead of thefirst leg portion 751 and thesecond leg portion 752, afirst side plate 7501 and asecond side plate 7502 are fixed to the opposed ends of thecoupling holding portion 73 and extending in the front/rear direction. End portions of thefirst side plate 7501 and thesecond side plate 7502 corresponding to thecoupling holding portion 73 are interconnected via aninterconnecting plate 7503. Further, thefirst base plate 651 forms afirst guide plate 657 instead of thefirst bracket 653 and thesecond base plate 652 forms asecond guide plate 658 instead of thesecond bracket 654. Thefirst guide plate 657 is fixed in position so as to contact thefirst side plate 7501, and thesecond guide plate 658 is fixed in position so as to contact thesecond side plate 7502. Thefirst side plate 7501 and thesecond side plate 7502 respectively formguide grooves 7504 extending in the front/rear direction, whereas thefirst guide plate 657 and thesecond guide plate 658 respectively includeguide pins 755 engageable into theguide grooves 7504 respectively. That is, with a guiding function of theguide grooves 7504 and the guide pins 755, thecoupling body 70 is moved back and forth. The leading end of theoperational lever 830 is connected to thefirst side plate 7501. In response to a pivotal displacement of theoperational lever 830, thefirst side plate 7501 and thesecond side plate 7502, eventually, thecoupling body 70, are (is) moved back and forth. Thelock coupling link 840 too is connected to thefirst side plate 7501. - The present invention is applicable to a mower detachably mounting, between front wheels and rear wheels, a
mower unit 4 of various types configured to be capable of being ridden over by the left and right front wheels. The configurations of the lift link mechanism and themower unit 4 are not particularly limited in the present invention.
Claims (27)
1. A mid-mount mower having a mower unit mounted under a vehicle body between front wheels and rear wheels, the mower comprising:
a lift link mechanism having a front link and a rear link provided in the vehicle body and spaced apart from each other in a vehicle body front/rear direction;
an intermediate structure interconnecting one end of the front link and one end of the rear link via a pivot axis;
a blade housing having an engaged portion engageable with an engaging portion of the intermediate structure; and
a guide face configured to guide the engaging portion and the engaged portion to an engaging position in association with a movement of the vehicle body in the vehicle body front/rear direction so as to establish connection between the blade housing placed on a ground surface and the intermediate structure.
2. The mower according to claim 1 , wherein the intermediate structure includes a first member and a second member which extend in the vehicle body front/rear direction with forming a space therebetween, a front connecting member interconnecting front portions of the first member and the second member, and a rear connecting member interconnecting rear portions of the first member and the second member; and a plurality of the engaging portions are formed at opposed ends of the first member and at the opposed ends of the second member.
3. The mower according to claim 2 , wherein the engaging portion and the engaged portion are provided as a hole-pin engagement arrangement including an elongate slot extending in the vehicle body front/rear direction and opened in a vehicle body rear direction and an engaging pin engageable into the elongate slot.
4. The mower according to claim 2 , wherein the guide face are inclined faces formed in the engaging portion and the engaged portion.
5. The mower according to claim 4 , wherein the guide face of the engaging portion and the guide face of the engaged portion come into contact with each other in association with the movement in the vehicle body front/rear direction.
6. The mower according to claim 1 , wherein a power transmission mechanism for transmitting an engine power to a blade provided in the blade housing includes a vehicle body side power transmission mechanism and a mower side power transmission mechanism as units separate from each other: and
a power coupling mechanism for coupling an output shaft of the vehicle body side power transmission mechanism with an input shaft of the mower side power transmission mechanism is supported to the intermediate structure.
7. The mower according to claim 6 , wherein the power coupling mechanism includes a coupling body having a first coupling end to be connected to the output shaft and a second coupling end to be detachably connected to the input shaft, a coupling holding portion for holding the coupling body, and an attaching unit for attaching the coupling holding portion to the intermediate structure with allowing displacement of the coupling holding portion in the vehicle body front/rear direction.
8. The mower according to claim 7 , wherein the attaching portion causes the coupling holding portion to move linearly between a connecting position realizing connection between the second connecting end and the input shaft and a releasing position realizing release of the connection of the second connecting end to the input shaft.
9. The mower according to claim 8 , wherein a first locking mechanism is provided for locking the coupling holding portion at the connecting position.
10. The mower according to claim 1 , a second locking mechanism is provided for locking the engaging portion and the engaged portions at the mutually engaged position.
11. The mower according to claim 8 , wherein a first locking mechanism is provided for locking the coupling holding portion at the connecting position and a second locking mechanism is provided for locking the engaging portion and the engaged portions at the mutually engaged position;
the first locking mechanism and the second locking mechanism include a common rotational operation shaft: and
the first locking mechanism locks the coupling holding portion at the connecting position in association with a rotational displacement of a first acting portion provided on the rotational operation shaft and the second locking mechanism locks the engaging portion and the engaged portions at the mutually engaged position in association with a rotational displacement of a second acting portion provided on the rotational operation shaft.
12. The mower according to claim 11 , wherein a rotational operation on the rotational operation shaft is effected by an operational arm extending to a periphery of a driver's seat.
13. The mower according to claim 1 , wherein the blade housing includes a gauge wheel unit for varying a ground level of the blade housing;
the gauge wheel unit is selectable to set positions creating different ground levels; and
the set positions include a position for causing at least a portion of the blade housing to come into contact with a ground surface.
14. A mid-mount mower having a mower unit mounted under a vehicle body between front wheels and rear wheels, the mower comprising:
a lift link mechanism having a front link and a rear link provided in the vehicle body and spaced apart from each other in a vehicle body front/rear direction;
a blade housing having an engaged portion engageable with an engaging portion provided in the vehicle body in association with a movement of the vehicle body in a vehicle body front/rear direction;
a blade power transmission mechanism having a vehicle body side power transmission mechanism and a mower side power transmission mechanism as units separate from each other and having also a power coupling mechanism for coupling an output shaft of the vehicle body side power transmission mechanism with an input shaft of the mower side power transmission mechanism; and
a coupling operational tool for establishing coupling between the input shaft and the output shaft by displacing the power coupling mechanism in the vehicle body front/rear direction in a connection state for establishing engagement between the engaging portion and the engaged portion.
15. The mower according to claim 14 , wherein the power coupling mechanism includes a coupling body having a first coupling end to be connected to the output shaft and a second coupling end to be detachably connected to the input shaft, a coupling holding portion for holding the coupling body, and an attaching unit for attaching the coupling holding portion to the vehicle body with allowing displacement of the coupling holding portion in the vehicle body front/rear direction via the coupling operational tool.
16. The mower according to claim 15 , wherein the attaching portion supports the coupling holding portion such that the coupling holding portion can move linearly between a connecting position realizing connection between the second connecting end and the input shaft and a releasing position realizing release of the connection of the second connecting end to the input shaft.
17. The mower according to claim 16 , wherein the coupling operational tool is pivotally supported to the attaching unit and the coupling holding portion is moved linearly in association with a pivotal displacement of the coupling operational tool.
18. The mower according to claim 14 , wherein a first locking mechanism is provided for locking state of the connection between the input shaft and the output shaft.
19. The mower according to claim 18 , wherein the first locking mechanism locks the coupling operational tool at an operational position for connecting the input shaft to the output shaft.
20. The mower according to claim 14 , wherein a second locking mechanism is provided for locking the engaging portion and the engaged portions at the mutually engaged position.
21. The mower according to claim 20 , wherein the second locking mechanism includes a locking engagement piece pivotally supported to the vehicle body and a locking link for pivoting the locking engagement piece; and
the engaging portion and the engaged portion are locked when the locking engagement piece comes into engagement with the blade housing in association with a pivotal movement of the locking engagement piece.
22. The mower according to claim 21 wherein a displacement of the operational tool is transmitted to the locking link and the locking link converts this displacement of the operational tool into a displacement of the locking engagement piece.
23. The mower according to claim 14 , wherein there is provided an intermediate structure connected via a pivot axis to one end of the front link and one end of the rear link; and
the engaging portion and the vehicle body side power transmission mechanism are provided in the intermediate structure.
24. The mower according to claim 23 , wherein the intermediate structure includes a first member and a second member which extend in the vehicle body front/rear direction with forming a space therebetween, a front connecting member interconnecting front portions of the first member and the second member, and a rear connecting member interconnecting rear portions of the first member and the second member; and a plurality of the engaging portions are formed at opposed ends of the first member and at the opposed ends of the second member.
25. The mower according to claim 24 , wherein the engaging portion and the engaged portion are provided as a hole-pin engagement arrangement including an elongate slot extending in the vehicle body front/rear direction and opened in a vehicle body rear direction and an engaging pin engageable into the elongate slot.
26. The mower according to claim 23 , wherein a guide face is provided to guide the engaging portion and the engaged portion to an engaging position in association with movement of the vehicle body in the vehicle body front/rear direction so as to establish connection between the blade housing placed on a ground surface and the intermediate structure.
27. The mower according to claim 26 , wherein the guide face are inclined faces formed in the engaging portion and the engaged portion.
Priority Applications (1)
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US15/455,652 US10327383B2 (en) | 2013-12-27 | 2017-03-10 | Mid-mount mower with power transmission coupling |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2013272821A JP6162600B2 (en) | 2013-12-27 | 2013-12-27 | Mid-mount mower |
JP2013-272821 | 2013-12-27 | ||
JP2014158726A JP6235431B2 (en) | 2014-08-04 | 2014-08-04 | Mid-mount mower |
JP2014-158726 | 2014-08-04 |
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US15/455,652 Division US10327383B2 (en) | 2013-12-27 | 2017-03-10 | Mid-mount mower with power transmission coupling |
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US20150181803A1 true US20150181803A1 (en) | 2015-07-02 |
US9622406B2 US9622406B2 (en) | 2017-04-18 |
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US15/455,652 Active US10327383B2 (en) | 2013-12-27 | 2017-03-10 | Mid-mount mower with power transmission coupling |
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US15/455,652 Active US10327383B2 (en) | 2013-12-27 | 2017-03-10 | Mid-mount mower with power transmission coupling |
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US20170167112A1 (en) * | 2015-12-14 | 2017-06-15 | Kubota Corporation | Work Vehicle |
US10512215B1 (en) * | 2018-01-08 | 2019-12-24 | Daniel S. Henneberry | Trenching and edging attachment for a riding lawn mower or compact utility tractor |
US20200178461A1 (en) * | 2018-12-06 | 2020-06-11 | Kubota Corporation | Work Unit |
WO2021093284A1 (en) * | 2019-11-15 | 2021-05-20 | 丰疆智能科技股份有限公司 | Height adjustment device and mower with same |
US11212952B2 (en) * | 2019-08-16 | 2022-01-04 | Deere & Company | Drive over mower deck automatic locking mechanism |
US20220142051A1 (en) * | 2020-11-11 | 2022-05-12 | Techtronic Cordless Gp | Mowers, mower deck mount systems, and methods |
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EP4393291A1 (en) * | 2022-12-27 | 2024-07-03 | Stiga S.p.A. in breve anche St. S.p.A. | Hooking device |
Also Published As
Publication number | Publication date |
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US10327383B2 (en) | 2019-06-25 |
US20170181374A1 (en) | 2017-06-29 |
US9622406B2 (en) | 2017-04-18 |
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